PC won't turn on but motherboard lights suggest it is fine?

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1

I've just built a new PC and it turned on perfectly when I first tried it, I then moved onto installing windows and got to the 'Expanding Windows Files' bit, was a bit slower than a remember but was doing it fine anyway, but then the computer just turned off and if you try to press the power button, nothing happens. I have a Ethernet cable plugged in and the lights show that is has power. Also there is a green light on the motherboard suggesting to me that it is fine. I am a bit stumped at this, I've built many computers and then have all worked fine and I have never come across a problem like this before. Any ideas guys?

Just a quick rundown of the specs just in case:

Intel Core i5 3470

ASUS P8Z77-M

Nvidia GeForce GTX 650Ti

Corsair XMS3 RAM 8GB (2x4GB) @ 1600MHz (showed up as 1333MHz in BIOS)

Seagate Barracuda 1TB HDD

Zalman Z9 Case

XFX Pro Series Core Edition 450W PSU


Thanks,

Boss1996


Original questions I asked on Yahoo Answers: http://uk.answers.yahoo.com/question/index?qid=20130221031525AATJ9Bu

2

I would also assume maybe shy on the power supply?  It looks like there is on-board video, try taking out the video to see if it follows through?  Hopefully I'm right, wouldn't want different kind of hardware issue (knock on wood). GL

3

Thanks, it does seem to be the power supply as it works without the graphics card power plugged in. The GPU seems fine still anyway, even without power pluged in, when I turn the pc on, the gpu fan has a quick spin, so that suggests to me that it has not been damaged.

Anyway, I've bought a new PSU, it is 550W this time and it is also the same PSU that I use in my own personal gaming system that powers a i5 2500k and GTX 560Ti, since 3rd gen 'i' processors and 600 series graphics cards should be more power efficient and use less of it, it should work (hopefully) :)

 

Thanks,

Boss1996

4

Always check the ram also.  If it is not installed properly or sometimes the motherboard and the ram have compatability issues.  Just a thought.