my monitor went black one day. didn't know if it was the monitor or something else. hooked up the monitor to another computer and it worked fine. looked things up on the internet and concluded to try a new video card.
did another disk repair using first aid. it failed. got "keys out of order" could not be repaired. error: the underlying task reported failure on exit. "HFS volume checked" failed and could not be repaired. anything else i can do???