My old, black (irony), pre-unibody (2009?) MacBook won't properly turn on. The screen just stays black. I can't hear the startup sound and the keyboard caps lock light won't shine, either. The power light, hard drive, and fans both start and work.
I tried connecting it to TV (via mini-DVI to HDMI adapter) and I can't see anything, although TV thinks that there is some signal coming.
It didn't happen suddenly - previously it sometimes started, sometimes not. Once working it would work for weeks until switched off manually. Then one day it wouldn't start at all.
I think that the motherboard could be near death, but the fact that some components work gives me hope.
Any suggestions are welcome. I have a new Mac now and all data has been backed up so I can try pretty much anything.