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Windows 7 PC suddenly powers off

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Re: Windows 7 PC suddenly powers off

Postby James Perrett » Fri Sep 25, 2020 4:45 pm

Marbury wrote:
Trevor Johnson wrote:
try looking for the cheaper Corsair/Antec and see if they are about

Aerocool, it might be fine, it might not.

I would go for this Corsair instead on the budget specified:
https://www.scan.co.uk/products/450w-corsair-cv-series-cv450-fully-wired-80-plus-bronze-single-rail-36a-120mm-fan-atx-psu
Just about to go for it but realised it's a 450 w, where mine old one was 430 w so not sure it would be too powerful

For a PC power supply, more power is good - too little power is bad.
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Re: Windows 7 PC suddenly powers off

Postby Marbury » Fri Sep 25, 2020 5:31 pm

Ok, I got inside the pc and managed to disconnect the PSU (which was an ordeal in itself as so many wires) and tried to run this test with my multi meter. Unfortunately the fan didn't stay on long enough to run the test. It just cut off almost imediatley.

is it a safe bet that the fan is the issue and needs replacing or the whole PSU ?
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Re: Windows 7 PC suddenly powers off

Postby James Perrett » Fri Sep 25, 2020 5:39 pm

Marbury wrote:is it a safe bet that the fan is the issue and needs replacing or the whole PSU ?

It is much more likely to be a PSU problem so it would be sensible to buy a replacement PSU.
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Re: Windows 7 PC suddenly powers off

Postby ef37a » Fri Sep 25, 2020 6:10 pm

I know this sounds a bit 'untechnical' but have you tried giving it a slap?

The computer in my living room has had a fault for years whereby sometimes it does not start up and a bumping the case gets it going. It has been very good for a long time but just a week ago the DVD drive died. Got one from the PC repair shop down the frog for a score and it fixed that but, today, at 7am it started up but cut out 5 mins later. Pushed the button, running again, barely got Radio 3 on and, dead again. Gave it a slap and it has been running ever since.

Now, a year or so ago I decided to fix this and had it on the table running and pushed and pulled EVERYTHING. Could not make it go off. Put it all back and it was fine for a month then "Bing! Off again.
Thing is you see, if a "technically applied acceleration"is applied and either starts it up or causes it to fail you know you are looking for a bad connection or dry solder joint. FINDING same is whole other barrel of fish!

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Re: Windows 7 PC suddenly powers off

Postby blinddrew » Fri Sep 25, 2020 7:01 pm

"Percussive maintenance" they used to call it...
;)
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Re: Windows 7 PC suddenly powers off

Postby merlyn » Fri Sep 25, 2020 8:15 pm

Marbury wrote: Unfortunately the fan didn't stay on long enough to run the test. It just cut off almost imediatley.

It sounds like you have the power supply plugged into the mains with nothing connected. When you plug it in like this the fan can briefly spin up. The power supply isn't on. To switch it on you need to short the 'on' pin to ground. You can look up a pinout for your exact connector to find out which one is the 'on' pin.
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Re: Windows 7 PC suddenly powers off

Postby Marbury » Sat Sep 26, 2020 1:32 pm

Yes I did that by following a Youtube video with a bent paperclip, but it still didn't work. I reconnected the PSU back to the PC ad it won't power up at all now, not even the fan. Not sure what to do now as I still don't know for sure what the problem is.
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