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Computer not turning on.

Last response: in Systems
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October 16, 2012 9:14:42 AM

Hi, I just got a new case and power supply (nzxt switch 810 and corsair ax1200) but my computer isnt turning on. I believe I have plugged everything in in the right place. What happens when i try to turn my computer on is all the fans start going and my cpu fan lights up but then turns off within half a second.

I know this isnt much to help with but you guys might have an idea on what to try and do or what to fix up. Thanks :) 

More about : computer turning

a b ) Power supply
October 16, 2012 10:14:48 AM

A few things you can try:

- Check and double check all of your connections.
- Perform a BIOS reset (check the motherboard documentation on how to do this).
- If you have on-board graphics, try booting with that and not the discrete GPU.
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October 16, 2012 11:25:21 AM

Herr_Koos said:
A few things you can try:

- Check and double check all of your connections.
- Perform a BIOS reset (check the motherboard documentation on how to do this).
- If you have on-board graphics, try booting with that and not the discrete GPU.


Well i have just spent the last few hours trying to fix this. I have taken out my motherboard multiple times and plugged in all the cables again. I have also tried reseting the BIOS but nothing would happen and I have also tried using onboard graphics but still no luck. Same thing keeps happening, starts up after being left a couple minutes then turns off almost instantely.
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a b ) Power supply
October 16, 2012 11:34:34 AM

Try putting the old PSU back if you still have it.
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October 16, 2012 11:48:02 AM

Herr_Koos said:
Try putting the old PSU back if you still have it.


Well the new power supply seems to be the problem as the old one works perfectly. Would you suggest returning it for a new one under warranty or do you know a way to fix it?
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a b ) Power supply
October 16, 2012 11:49:08 AM

if the mb is cycling on and off it could be that the mb cant set the ram speed right. (doing an overclock failure). if the mb has code led or led post codes see if there showing an error. most times a power on then shut down is a missing standoff and a short. or you forgot to conenct the 4/8 pin atx. power connector.
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