Computer powers on but no display after changing mobo

RushFOUR

Reputable
Mar 17, 2014
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4,510
I was playing a game last night and my computer shut off completely. No blue screen, no warning, just off. My power light was flashing and I tried to turn it back on, thinking it had gone into sleep mode, and it wouldn't power back on. So I reset the PSU and tried to turn it on again, only to find that the Motherboard speaker didn't beep and the LED lights on the Motherboard flashed for a split-second and the fans began to spin, only to turn right off again. I tried to power on again, and nothing. The only time I could get that to happen was directly after resetting the Motherboard.

I took out every part and put them back on 1 by 1, and came to the conclusion that everything would spin and run smoothly except when I connected the 8 pin connecter to the CPU power slot on the Motherboard. That's when the problem would start to occur again.

I came to the conclusion that it had to be a bad Motherboard, CPU, or PSU. I borrowed some parts from some friends, which all had similar computer setups to mine, and I started swapping out parts. I connected the same exact model CPU to my Motherboard: same thing. I swapped in two different PSU's, all with higher wattage and better than my own: same thing.

So I concluded that it must be the Motherboard. I swapped out my MSI 970A-G46 for a friend's ASRock 990FX Extreme3, and got everything hooked up. I also used his CPU just to make sure, because I know for sure that his works as he just recently took it off a working PC.

When I got everything connected, I started up the computer, and everything ran perfectly. I connected all of my peripherals, and started the computer up again. Everything seemed to run fine, however I still don't get a beep from the Motherboard speaker and now there is no display on my monitor. I hooked the monitor up with 3 different cables, and hooked it to my laptop to ensure that it was not the problem.

I started off with one problem, replaced the motherboard and CPU, and now I'm having a different problem. I turn on the computer, only to find that nothing beeps and there is no display. I unseated the Motherboard, thinking it may be shorting out on the case, and held it whilst starting the computer again. This time I hear a couple of beeps, but I'm unsure if it's from the Motherboard speaker or not because it's very feint. I have unseated all of my RAM modules, and I have retried all of the CPUs and PSUs I have, and I can't get a display to work. Also, I was going to connect directly to the onboard graphics to try and troubleshoot even further, however this "new" Motherboard that I put in doesn't seem to have an onboard graphics.

Any ideas?

PC Specs:
AMD 8350 FX CPU
ASRock 990FX Extreme3 Motherboard (Swapped from MSI 970A-G46)
2x 8GB GSkillz RAM
nVidia GeForce 650 TI
Corsair CX500 PSU
 

RushFOUR

Reputable
Mar 17, 2014
3
0
4,510


Thanks for this link, I have seen it but I went back over it again. Couple of questions about this.

Firstly, my case doesn't have the little spacers in them, but they do have raised little "bumps" where the screwholes are. I assumed this was for easier motherboard installation. However, I fear it could be causing it to short out against the case, which is why I was pulling the motherboard out and connecting everything to see if I could hold it by the edges and get it to boot.

Also, I disconnected everything but the CPU and fan and tried to start it, and the system speaker still didn't beep. Would this mean that the problem is definitely with the CPU, motherboard, or PSU? I think I can rule out the PSU since I have tried 3 different ones and have gotten the same results. But I would also be equally surprised if the motherboard and CPU were bad since my friend was using them just recently and they were perfectly okay.

Maybe they were harmed in some way during transfer. Also, while doing this test I did leave the cord connecting the hard drive to the PSU connected, but the SATA cords were disconnected for the HD and the Disc drive, so I don't think that would affect my results, would it?