check for a jumper setting of SD.... if it is hooked up with nothing else on each IDE, the drive (if it has SD) needs to be set on it. I dont remember which brand/manu has it, but it is for "single drive". Set if for that if avail. Also, since it wont boot with it plugged in, try clearing the NVRAM by bios or by jumper.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.