internal and external display (video) problem
I found apple's "apple hardware test" manual and decided to test my old laptop. So I pressed down "D" after restarting the computer. The screen went black, as it was supposed to.
When I turned it back on, i heard normal internal noises (dvd reader had nothing in it so I tried putting a DVD in and it took it, but the eject button doesn't work)
it is usually hooked up to an external display, which also didn't display anything.
so this is clearly not a power problem, since i found the fans were running.
I also switched the Hard drives with my new macbook: New MB was running properly while old MB still displayed nothing with the other MB's Hard drive. I don't know if this is relevant.
Any idea on what the problem may be ? my mac has been running very well for the past three years this was all very sudden, I never had any problems with it.