PC won't turn on

Upgrade · 14 Aug 2012 at 20:26

Finally got a new motherboard and a case.

But when it's all plugged in, nothing happens. If I plug in the PSU that came with the case, motherboard lights pop up, but with my PSU that doesn't happen. We tested my PSU with a paperclip and a fan (found from corsair) and it powered up the fan - so my PSU does work.

I have no idea what to do now..

:/

Upgrade · 14 Aug 2012 at 21:04

Likelyhood of a psu and motherboard not being compatible with each other...?

Kennysevenfold · 14 Aug 2012 at 21:09

what psu and what motherboard?

Upgrade · 14 Aug 2012 at 21:17

Corsair TX 650 and Gigabyte P55A-UD3

pc_monkey · 14 Aug 2012 at 21:18

Are you connecting the 4pin or 8pin on the mobo properly? This happened to me before and that was the culprit, somehow I managed to fit it the other way round LOL

Upgrade · 14 Aug 2012 at 21:21

Psu that came with case, we plug in only the 24 pin and there's motherboard beeps and lights, with mine we plug in the 24 pin and 6 (?) pin and nothing works.

iTek · 14 Aug 2012 at 21:21

Have you got the header cables correct? PWR Switch.

NVM.

Upgrade · 14 Aug 2012 at 21:22

I'm starting the think my PSU is damaged, even though it powers up outside the case..?

olivier renault · 14 Aug 2012 at 21:52

Then it's most likely something else.

Another trick you can do is short the two pins that connect to the case power up button, which is basically what the button does. Double check your front panel connectors and see if they are plugged at the right pins.

14:30 mins in.

Kennysevenfold · 14 Aug 2012 at 21:55

irsean said:
I'm starting the think my PSU is damaged, even though it powers up outside the case..?

Could just be the cpu power connectors on the psu thats faulty.

The pc wont turn on if the motherboard has no cpu power cable installed.

Thats why it might power up on its own when shortening the pins.

Have a DMM handy?

Upgrade · 14 Aug 2012 at 22:13

Just an update - plugged my psu into an old, old pc and it runs, therefore PSU should be fine..

Still confused.

Upgrade · 14 Aug 2012 at 22:13

Although the old pc it was plugged in had 4 pin only by cpu and not 8.

Kennysevenfold · 14 Aug 2012 at 22:16

irsean said:
Although the old pc it was plugged in had 4 pin only by cpu and not 8.

Tried plugging the same 4pin into the new pc?
Should still work with just the 4 pin connected.

Upgrade · 14 Aug 2012 at 22:19

Will try, thanks.

Dad plugged his psu into my computer and it powers up... will try with 1x 4 pin

Upgrade · 14 Aug 2012 at 22:24

When I say it powers up, I mean that lights on the motherboard works, its not actually ever powered up. It's just continual beeps.

Upgrade · 14 Aug 2012 at 22:30

Tried my psu into my dads pc and it works and powers up. Used 2x4 pins, therefore my PSU must 100% work. However it doesn't in my PC, yet his does.

Anyone else just as confused as me?

Upgrade · 14 Aug 2012 at 22:40

I guess its down to a dead cpu or faulty motherboard? :/

bremen1874 · 14 Aug 2012 at 22:43

Have you tried it with all of the components outside the case?

You could have a short that the Corsair is detecting and the othe power supplies aren't. The fact the you're getting error beeps indicates that something beyond the power supply is probably wrong.

Upgrade · 14 Aug 2012 at 22:48

It's been tried with all components out. But it makes no sense how my Corsair wont work in mine with all components out, but my dads PSU (not sure on make) plugs into mine with no components and works.

MADMAN · 14 Aug 2012 at 22:54

very odd, I would again do it all again but bare bones state...

cpu/heatsink + fan/ram/gpu and power supply............ all outside of the case on a static matt/flat surface for now.

Sometimes its the cpu back plate shorting it out, ive had to tape the back of it and then stick it on even, also test with no usb devices or keyboard,mouse.... u want a clean start also dont forget once all is connected outside the case tap the screwdriver onto the pwr on switch on the motherboard header to switch on the motherboard (pc) and see if u get a display.

try this and see where u get