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New Computer, Bad PSU, No Signal = Dead Motherboard?

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May 18, 2013 2:28:16 PM

Hi, a couple of days ago I got a new desktop from HP, the Pavilion HPE h8-1360t. Along with it I ordered an EVGA Nvidia GTX660, and a Corsair CX600 builder series PSU, as separate products. Unfortunately, the PC is currently not working.

To ensure that my computer ran correctly before installing the third-party components, I ran the computer after starting it up for an hour or so, with no problems. Everything ran fine. After shutting the CPU off, I uninstalled the default PSU and GPU, installed the GTX660 and the new PSU. When I plugged the PSU in, it gave no juice to the computer (despite the fact that it took in energy from the outlet), and it was unable to power on. It also gave off the faint odor of burnt electronics.

Took it to Best Buy, where some friends work, they checked everything, found the PSU was faulty and supplied no power to the motherboard. Took everything home, ordered a new PSU and refunded the old one (same model).

I had them take a look at the new PSU to make sure it worked. They said every plug was correctly distributing power. Installed it on the new computer, hooked it up to the GPU and turned it on. This time it powered on, but when it booted, there was no signal, and there were no sounds either, indicating the boot was not completing.

Called HP customer service since it's under warranty. They had me remove the ram sticks and attempt a boot, whereupon the motherboard is supposed to beep if started up without them (at least, that's what I've read). No such beeps. They're sending me a new motherboard and sending out a tech to install it along with the PSU and GPU that I got.

But I'd figure I'd check with you guys since you're probably familiar with this situation. Is this an occasional thing where a PSU takes juice but doesn't give it properly, and that a PSU that's dead on arrival kill a motherboard? Are there any other possible culprits, or is the "no beep" thing with the RAM sticks a sure sign that the motherboard died? Also, I had my GPU plugged in to the faulty PSU when I installed everything. I haven't been able to use the GPU yet, but is it likely that the failing original PSU killed that, too?

Thanks for any help!
a b α HP
a c 462 V Motherboard
May 18, 2013 2:39:46 PM

If the hp has onboard video I would see if the system will boot from onboard video with no other gpu connected. Also check that you plugged in the four..eight pin atx power in. On new power supply be care fule don't mix up the six plus two cable with the black four plus four pci power. If there was a short most mb won't turn back on till te CMOS is drained and cleared.
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May 18, 2013 2:56:11 PM

This computer doesn't have an integrated card. It came with a dedicated NVidia GT630, so doing so that way will be impossible.

I couldn't find an adequate installation guide and didn't have a lot of time when I was first setting this up. I plugged one of the the PCI-E into the ATX outlet. With what you say, it makes sense then that I wouldn't be able to start the computer up.

Only thing though, is that I can't access BIOS during the boot up. I tried that, with no success.
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a b α HP
a c 462 V Motherboard
May 18, 2013 9:41:17 PM

Try clearing the CMOS using the jumper. If there no hp splash screen then there could be an issue with the mb. Most new mb now have one hdmi mini video port. My asus saber tooth mb has one.
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