Upon turning on I get a long text:
"Intel UNDI, PXE-2.0 (build 003)
Copyright (C) 1997-2000 Intel Corporation

For Atheros PCIE Ethernet Controller v2.0.2.6(09/28/10)

Check cable connection!
PXE-MOF : Exiting Intel PXE ROM.
No bootable device -- insert boot disk and press any key"

I have no idea what it could be. I haven't opened any untrusted files. Anyone who can decipher this is a wizard. Thanks ahead of time.