My MBP has a strange issue. The symptoms are that I press the power button, hear Superdrive make a noise, HDD spins, light at the front stays on and is responsive to light changes, display stays black and there's no chime.
At first, it presented exactly the same as the well-known nVidia issue but I took it to the local AASP and they said it was something to do with the startup of the machine, not the nVidia chip. I didn't believe them at first because I brought it home and it started working, despite calling me to charge £375 for repair and £750 for new logic board. Also, at that time, I found that the date had been reset to default and that the machine booted up on Jan 1st at 00:01, according to the Console.
Fast forward to yesterday and this happened again - same symptoms. I intended to open the machine up and took out the battery while I got my screw drivers. Turned it on one last time and it came up...yay! Date was the same so they must have done something to reset this previously.
And now today - same again. This makes no sense to me - it can't be a software issue because of the resurrection, but it must be because they said they could repair it.
I hope someone with a little MBP repair experience can make sense of this and maybe shed some light on what the problem might be!
I've been in the PC support business for over 10 years and if it was a PC I'd say it would be BIOS or firmware related, but the intermittent nature of this makes no sense. Have tried resetting the SMU and PRAM.