Computer boots to black screen with E7 in corner
We have a desktop that won't boot to Windows, the network or any external device, including bootable usb stick (so can't flash the BIOS). It hangs on a black screen with E7 in the lower right corner about 10-15 seconds after pressing the on/off button. There are no beep codes. I can get into the BIOS but I can't boot into safe mode, I have reset the BIOS to default, swapped out the HDD and SATA cable, changed the memory and it has onboard graphics. Has anyone come across this problem and if so did you resolve it? The computer is out of warranty. I will try swapping out the power supply and processor next. Anyone have any other ideas?