Help needed, pc power supply woes

[_Dave_]

Hi All, help needed, bare with me because I´m crap!

Pc power supply went tits up at the weekend due to all the power cuts we have been having, whipped the old one out, trotted off to shop and bought a new one.

This one:


I then connect it all up again and everything seems to have power but it won´t boot up or beep and I have a blank screen.

The only differences as far as I can see is that the new supply has 2 S-ATA plugs where the old one didn´t, my hard drive has just a standard 4 pin supply, yellow, 2xblack and one red.

Have I bought the wrong power supply?



As far as I can tell, 1,2 and 3 are DVD writer, CD Drive and Floppy, 4 is 20 pin supply for motherboard, 5 is 4 pin for top lhs of motherboard and 6 is for Hard drive and aux fan.

I have nothing to plug into S-ATA plugs

Thanks in advance as its pretty urgent!!

Edited by _Dave_ on Tuesday 10th April 17:01

[SneakyNeil]

Nah sounds like it's the right one. Try it with just the 4-pin and 20-pin connected to the motherboard, and everything else disconnected from the motherboard (except the switches to turn it on etc. obviousley) and see if you get a display. If still not, re-seat all the components (ram, cpu, video, etc.) and repeat. If still nothing, the old PSU probably killed the mobo on it's way out. Sorry.

[ThePassenger]

Unplug everything bar the mobo and the chassis header block (speaker, HDD light, etc). Make sure the PSU's switch is 'On' if it has one. Try changing the fuse in the plug (hey you did say it went bang).

If none of that works then your mobo has gone the way of the Dodo.

[LordLanky]

Don't forget that you can jam a voltmeter up the power connectors to make sure you are seeing 12v DC at those 4-pin molex plugs (2, 3 & 6 in your photo).

Also your shop should be able to test your old (and new?!) PSUs if you are without voltmeter, to ensure it's dishing out the correct voltage(s).

I'd concur with ThePassenger, in that there is a good chance the Mobo &/or CPU have failed. :-(