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No post beep, pc needs at least 2 drives to boot.

Last response: in Systems
April 18, 2013 7:34:31 AM

I have a bit of an odd problem. I won't mention everything I did, just the symptoms/issues I've narrowed it down to.
About a month ago I purchased new PC components:
- Asrock 970 extreme3 motherboard
- AMD FX 8-core CPU black edition
- Club3D AMD Radeon HD7950 GPU
- Two Corsair 4GB 1333 RAM
- Seagate 1TB Hdd
- Coolermaster 620W PSU (from a friend)

I rushed the build a little, installing the optical drive from my old pc. I booted windows 7 64 from a USB and it worked fine, though there was no post beep. At the time I wasn't worried about the post beep, but sometimes when I attempted to boot only the fans would spin and I'd get no signal to my keyboard, monitor, nor mouse. Sometimes the system would get stuck on the shut-down screen and emit a continuous static noise. These would occur 1/10 times, independently. Besides these issues the system performed without a hickup.

I installed my old 300GB HDD after that; the boot issue no longer occurred. Someone wanted to buy my old pc, so I removed the optical drive and 300gb hdd; now my new pc won't start up again (fans spin but no cigar).
After some troubleshooting and testing I ruled out the RAM. Due to perfect functioning, I ruled out the CPU. Temperatures remain stable around 40, so that's not it.
Here's what's weird:
-If I plug in my old AMD 4670 card, I need to plug the POWER into both hdds and the optical drive, and one sata from the hdd with OS to boot.
-Having my 7950 GPU inserted I only need EITHER 1 hdd and the optical drive (power cables), OR 2 hdds for it to boot.
-And (here comes the post beep up again) with no GPU inserted the speaker will give 5 beeps (indicative of no video output), which means the speaker is not busted.

I know it sounds weird, but it seems as though I need a minimal wattage consumption for my pc to work. I'm leaning towards PSU, but the beep issue might suggest my mobo is busted. Plus, I was able to test the PSU on my old and it worked fine.

What do you guys think? And if you rule in favor of the mobo, do you suggest I just buy an optical drive/another hard drive, or should i get another mobo?

More about : post beep drives boot

April 18, 2013 9:28:35 AM

I would swap in a know working PSU... that is weird