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Pciex16_1 slot not working but pciex16_2 is

Last response: in Motherboards
April 7, 2011 8:26:42 PM

New Build:

Asus p7p55d-e pro
i5 760
8gb Gskill ddr3 ram
1 tb sata6 seagate
Asus dvdrw
GeForce gtx 550 ti

Board worked fine after build. 3 hours later PSU failed. Returned it.
Now my gtx 550 ti wont post on the first pci-e slot, PCIEX16_1, but it will in PCIEX16_2 slot.
Everything else works just fine. I reset cmos, than flashed bios and nothing. Still no post on pciex16_1 slot
Any Ideas?
April 7, 2011 10:01:21 PM

Well, I think I answered my own question.
"The board features two PCI-E 16x slots (will degrade to 8x for dual-GPU), three PCI-E 1x and also two legacy PCI slots, one of which will likely be wiped out if a second GPU is installed. To the right of the absolute bottom PCI-E 1x slot is the PLX chip in all its glory. This chip essentially creates a secondary PCI-E Gen 2.0 16x lane in order to provide additional bandwidth to both S-ATA and USB 3.0. This is the reason that the native PCI-E 16x is left alone." --

Could this be why my first pcie-x16 stopped working and not the other? Bad controller on the mobo? I am not an expert in computers so any incite would be appreciated.

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April 8, 2011 4:57:30 AM

Chances are that the power supply failure damaged your mother board....
This is why you don't go cheap on power supplies...Corsair, PCPower&Cooling,seasonic are good supplies.
You should send the board back and get it replaced...
April 8, 2011 2:33:39 PM

Okay so bad mobo. By the way, the PSU is a corsair. I guess even good brands go bad.