This is the error message I get in the event log:

A corrected hardware error has occurred.

Component: PCI Express Root Port
Error Source: Advanced Error Reporting (PCI Express)

Primary Bus:Device:Function: 0x0:0x1D:0x6
Secondary Bus:Device:Function: 0x0:0x0:0x0
Primary Device Name:PCI\VEN_8086&DEV_A11E&SUBSYS_07BE1028&REV_F1

I'm plugging in an external hard drive, I get a little beep to let me know I plugged something in, then the other beep and it disconnects. I can't find much on this error anywhere. Hard drive works plugging into other computers.