Hi, I put a computer together today with almost all new components. The only component that isn't new is the PSU but it was working late last year.

The issue I'm having is when I try to turn the computer on all the fans spin for about a second or two then turn off and spin again, so on and so forth.
I've tried without ram to see if I get any beeps and there were none, tried with and without the graphics card, same thing.

The current components are

450-500w Thermaltake PSU
Nvidia gtx 660 Graphics Card
DDR3 4 or 8gb ram(can't remember>_>)
Gigabyte B85M-D2V Motherboard

*edit*
I forgot to mention, the ram I'm using has two red lights in either side and they do light up when I try to turn the computer on.I also bought a new PSU, problem still persists.Well... you have done what seems reasonable.
Your tried no graphics.
You tried no RAM
You replaced the PSU.

You also need to  test the Hard drive and anything ELSE connected to the computer.

You may have to contact the vendor and request a RMA for the motherboard.


I got the board replaced but the problem persists, I'm really not sure what the issue could be.You haven't mentioned what processor you're using, that would be useful to know.
Only other thing I would suggest is to try the motherboard, CPU and RAM only, outside of the motherboard on a nonconductive surface such as the motherboard box.  HOOK it up to the PSU and use a screwdriver to briefly short the power switch pins on the front panel header to turn it on.  This would rule out a grounding/shorting issue inside the case.I'm using an i3 4160, I've tried with just motherboard, cpu and ram on a box, did all that didn't change anything.Based on what you've said - that you've tried everything outside the case, tried two different PSUs (one brand new, one was working not so long ago), and two boards - I'd say that assuming you have tried each stick of RAM individually, the only thing left is a dead CPU, however unlikely that is.  I've built over 3000 computers and I can't recall ever getting a CPU that was dead out of the box, but it's not impossible.  The only other suggestion I could make is to try that processor in another compatible board and see if the other board POSTs or not, just to make absolutely sure.Would a FAULTY/dead cpu cause the fans to spin then stop then repeat indefinitely? I've never experienced a faulty cpu before.It could do yes, could also be a faulty board, PSU, cables not plugged in, a short, CPU not recognised (BIOS update required), or several other things. but you've pretty much ruled out everything else.I am having this exact issue.  All new components in old case.  It sounds like i should be looking at the case.
Do you suggest shorting across the on-off switch pins to rule out a bad switch?  Is that what I'm reading?Partly, but partly because it'd be difficult to use the case's power switch if you're testing outside the case
I have seen faulty power or reset switches cause issues before though so it's always worth ruling them out. Quote from: turchmania on June 18, 2015, 11:46:28 AM

I am having this exact issue.  All new components in old case.  It sounds like i should be looking at the case.
Do you suggest shorting across the on-off switch pins to rule out a bad switch?  Is that what I'm reading?