View Full Version : PC Power supply problem
paul_oshea
04/07/2007, 9:46 AM
Right lads PC isnt turning on. Changed the fuse in the plug, still no change computer wouldnt turn on, then changed the actual power lead and tried another one, still wouldnt turn on. The switch seems to be fine as it clicks but absoloutely nothing happens, so is this a motherboard problem or the power supply in the pc knackered? Would the fan come on if it was a motherboard problem? anything else i can check for, ive often changed hard drives, cd/dvd roms etc but never changed the power supply thingie in a pc.
If you have some way of measuring the voltage out of the power supply, that will answer your question. Are you sure the socket is working by the way?
To change a power supply is straight forward if you're familiar with pcs. I only just changed my sister's one recently (my sister's pc that is. I don't have a robotic sister).
paul_oshea
04/07/2007, 9:56 AM
noby i was getting confused there about your robotic sister :D
are power supplys standard as in one fits all?
The pc is plugged into a 4 plug extension lead, everything else plugged in works fine i.e. the router, speakers and monitor. The lead that went into the monitor also fits the computer so i tried that but it still didnt work.
are power supplys standard as in one fits all?
Pretty much, the cheap ones seem to last about a year in my experience, so its worth getting a good psu.
Superhoops
05/07/2007, 6:22 AM
There is a small black rocker switch located directly beneath where the power lead plugs into the PC, generally marked with O and -. Make sure the switch is set with - pressed in on the On position.
paul_oshea
05/07/2007, 8:08 AM
i dont see why that would have come undone superhoops....if it were ligthning would the fan still come on? i mean how do i know if the motherboard isnt just screwed and nothing to do with the power supply at all?
i mean how do i know if the motherboard isnt just screwed and the power supply at all?
measuring the voltage out of the power supply
So, is the fan coming on? I'm confused.
paul_oshea
05/07/2007, 8:34 AM
noby edited there for ye....sorry about that.
what i meant to say is, how do i know its not the motherboard that is screwed completely, would the fan come on even if the motherboard was screwed?? Therefore suggesting it wouldn't be the power supply but the motherboard that would be the problem........at the moment though nothing comes on, no life in the old dog as the man says.
Superhoops
05/07/2007, 8:44 PM
noby edited there for ye....sorry about that.
what i meant to say is, how do i know its not the motherboard that is screwed completely, would the fan come on even if the motherboard was screwed?? Therefore suggesting it wouldn't be the power supply but the motherboard that would be the problem........at the moment though nothing comes on, no life in the old dog as the man says.
If the motherboard was fried and the PSU was OK, the power light would come on at the front of the PC, the fan would run but the PC would not boot up.
If nothing comes on at all there is a 95% + chance the PSU is fuc**d. It would be bad luck if both PSU and m/board went at same time.
My only other suggestion is that on most m/boards there is a small neon light (usually green or red) which lights up when the power is connected, even before you switch on the PC.
If this light comes on when you plug in the power lead, it means that the power is coming to the m/board through the PSU.
I am not sure if this light is on all m/boards, but both my PC's have an Asus m/board and it is on both of these.
Can't help after that.
GavinZac
05/07/2007, 9:23 PM
if it were a motherboard problem, you would have the motherboard coming on and beeping.
i reckon its not just a motherboard problem, but a motherboard destruction. a little scratch or a little electrical shock can destroy the whole thing and make it unresponsive. did you take anti-static measures when openning the PC?
Superhoops
06/07/2007, 12:16 AM
if it were a motherboard problem, you would have the motherboard coming on and beeping.
i reckon its not just a motherboard problem, but a motherboard destruction. a little scratch or a little electrical shock can destroy the whole thing and make it unresponsive. did you take anti-static measures when openning the PC?
GZ, if it was 'just' m/board destruction, would he not still be getting power to the fan if the PSU was working?
paul_oshea
06/07/2007, 7:59 AM
i reckon its not just a motherboard problem, but a motherboard destruction. a little scratch or a little electrical shock can destroy the whole thing and make it unresponsive. did you take anti-static measures when openning the PC?
i didnt open it up yet. Ya hoops i thought the fan would still come on even if the motherboard was fupped.
GavinZac
06/07/2007, 11:15 AM
GZ, if it was 'just' m/board destruction, would he not still be getting power to the fan if the PSU was working?
no - because the signal from the motherboard to say "im on, turn on the fan" wouldn't be received. the power button at the front goes directly to the motherboard. the BIOS/CMOS of the motherboard then instructs the CPU fan, drives etc to request power.
paul_oshea
06/07/2007, 8:14 PM
the power thing goes to the motherboard but the PSU connects directly to the motherboard and thats how the motherboard gets power.
anyhow i opened it up, paid 37 sterling for a new PSU and hte light was coming on the whole time in the motherboard i just never noticed, however thats all that happens it must be fupped so im going getting another motherboard tomorrow. do motherboards come in the same size with the same sort of stuff?? im just going to get it in pc world or somewhere like that, cant be arsed waiting round. plus ye know exactly what you are getting when ye walk in etc....
GavinZac
06/07/2007, 8:52 PM
the power thing goes to the motherboard but the PSU connects directly to the motherboard and thats how the motherboard gets power. ... i know, but the fan will never know to come on unless the motherboard tells it to, and the motherboard will never come on if its broken and cant get the signal from the front button
anyhow i opened it up, paid 37 sterling for a new PSU and hte light was coming on the whole time in the motherboard i just never noticed, however thats all that happens it must be fupped so im going getting another motherboard tomorrow.told you so! :p
do motherboards come in the same size with the same sort of stuff?? im just going to get it in pc world or somewhere like that, cant be arsed waiting round. plus ye know exactly what you are getting when ye walk in etc....
theres ATX size which is most common and microATX or uATX as it is sometimes written (u representing the greek letter 'mew'). ATX is about the size of a laptop "keyboard", mATX about 2/3 the size of a laptop "keyboard".
paul_oshea
06/07/2007, 10:38 PM
gav this this one is about the size of a normal laptop in a square shape rather than rectangle. actually its exact measurements are:
9.5 inches by 9 and3/4 inches.
does it sound like the motherboard is fupped then? i get the orange light and i get a little static sound from the motherboard and then nothing happens. if so whats a good cheap motherboard i can get from pcworld ,will i have to pay for the processor separately?
I am also assuming the old hard drive will be able to be connected to the new motherboard and XP will load up ok like before?
I am also assuming the old hard drive will be able to be connected to the new motherboard and XP will load up ok like before?
eh no, best bet is get a pro to look at your pc, im sure you know someone who knows about hardware. Whatever you do DONT GO TO PC WORLD!!!!!
Its either a PSU is dead or mobo is dead, regardless your HD is still safe and anything on it can be got back.
For all the tech support offered here noone has asked the simple question.
What is your current PSU and what PC did it come with?
kdjac
if it were a motherboard problem, you would have the motherboard coming on and beeping.
i reckon its not just a motherboard problem, but a motherboard destruction. a little scratch or a little electrical shock can destroy the whole thing and make it unresponsive. did you take anti-static measures when openning the PC?
?
A dead motherboard doesnt beep and a dead psu will not make a motherboard beep.
kdjac
paul_oshea
09/07/2007, 8:33 AM
kdjac its not the PSU, as i got it changed and still nothing worked.
I cant remember the PSU off hand or the motherboard, but the dimensions of the motherboard are about 245 X 240 mm and its like this one ( with a few less pci slots ):
http://cgi.ebay.co.uk/Abit-KV8-Pro-Socket-754-AMD-Athlon-64-ATX-Motherboard_W0QQitemZ220128525735QQihZ012QQcategor yZ99244QQrdZ1QQcmdZViewItem#ebayphotohosting
It was a packard bell that I bought about 2 years ago from europc.co.uk. It was about 6 months old at the time.
I have a fair idea when it comes to the hardware, bar the motherboard ( obviously ) so i dont mind changing stuff and removing stuff as i have done a lot of it before.
GavinZac
09/07/2007, 8:40 AM
?
A dead motherboard doesnt beep and a dead psu will not make a motherboard beep.
kdjac
no, a dead anything wont beep. However, if you read both parts of my post, I clearly differentiated between a motherboard problem and a broken motherboard.
kdjac its not the PSU, as i got it changed and still nothing worked.
I cant remember the PSU off hand or the motherboard, but the dimensions of the motherboard are about 245 X 240 mm and its like this one ( with a few less pci slots ):
http://cgi.ebay.co.uk/Abit-KV8-Pro-Socket-754-AMD-Athlon-64-ATX-Motherboard_W0QQitemZ220128525735QQihZ012QQcategor yZ99244QQrdZ1QQcmdZViewItem#ebayphotohosting
It was a packard bell that I bought about 2 years ago from europc.co.uk. It was about 6 months old at the time.
I have a fair idea when it comes to the hardware, bar the motherboard ( obviously ) so i dont mind changing stuff and removing stuff as i have done a lot of it before.
Motherboard part number is wrote between the PCI slots, if its a packard bell possibly a low watt PSU 300 wattish using a hybrid MSI board. Part number of Pc is on the back usually about 15 digits long but only 4 matter :) The PSU will have a name and if it says Qtec <worst PSU ever it may have killed your board.
Did you add anything recently? As packard bells usally only ahve a PSU to cover whats in it so another HD or CD drive could cause it to stop powering everything.
kdjac
paul_oshea
10/07/2007, 8:26 AM
its a 250 watt PSU.
nah didnt add anything to it, there was lightning though last week and thats when it stopped working, but yet there was the wirless router and other things plugged in and they were fine....right ill look between the PCI slots, I couldnt see it on the underside as someone else mentioned it would be there....
whats the max processor speed that can be put in an ABIT SG-80 Intel P4 775 motherboard, was looking at one in maplins yesterday and the form factor dimensions are pretty much the same as the old motherboard that was in it.
GavinZac
10/07/2007, 9:52 AM
whats the max processor that can be put in an ABIT SG-80 Intel P4 775 motherboard
an Intel P4 775 :)
paul_oshea
10/07/2007, 10:07 AM
sorry meant to say speed!
ya but whats the max speed of a p4 processor is it 3 ghz or has all that stuff changed now too.....i am a little behind the times on this :(
anyhow is that motherboard worth getting or not? i have googled it and a lot of the documents and articles on it are not very recent plus some places no longer have it in stock.....
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