When I first started up the machine, it seemed to be working normally. I didn't have a monitor connected, so I couldn't see exactly what was happening. I turned it off and on again once, and it worked.
After that, every time I turn it on, it turns on for a second, and the case lights and fans turn on, and then they all turn off. Then if I push the power button, nothing happens, unless I wait a few minutes first, in which case it once again turns on for a second then turns off.
I thought the PSU was defective, but I RMA'd it and just got the replacement, and I'm still having the same issue. Could someone help me troubleshoot this problem? I'm leaning towards the motherboard being defective, but I'd like to be sure before I RMA another part.
Probably a heat issue...double check that you mounted the HSF correctly and that it is tight. After leaving it off for a while try to boot to the BIOS and check the temperatures there. While your PSU is of low quality, it should be enough to power that system.
I figured out the problem (sort of). That case has a lot of fans. When I disconnected all the fans except the HSF, the PSU fan, and one case fan, it successfully booted. Is this because the PSU can't handle any more than that?
Very weird... the PSU should be able to handle everything. Personally my computer boots for 1 second when I change voltages or when I shut it down via the PSU button, then it shuts down and starts again a couple seconds later...
Did you wait before pressing the button again?
I am having the same problem atm and I am guessing it is the PSU as well. They will overheat and shut down so having to let it cool for 2-3 minutes makes sense. I have had trouble with Rosewill in the past so maybe borrow a PSU or RMA it again and see if you have any luck.
Well, I moved it to a different room, and now I'm getting the same problem again. Is this most likely because of a loose connection or hardware problems?
Edit: I discovered something else that may be relevant. Like before, PSU switch has to be turned off then on again to get the system to start up for a second. ~13 seconds after I turn the PSU off again, a small hissing noise emanates from the PSU. After that, I can turn it back on and the box will turn on for a second.
Edit 2: It's working right now, with no explanation. Is there some way I can use this state to test for loose connections, etc.?
Edit 3: I moved it a few inches across the table it's on and it stopped working again
Edit 4: I moved the case again without touching _anything_ inside it and it's working again.
Edit 5: I tried removing/replacing the CMOS battery, and it started working again, but then it stopped. I think I'm going to RMA the motherboard.
Edit 6: I figured it out. The motherboard was screwed on too tightly, so it was occasionally touching the case and shorting out.