White screen on boot, no startup chime
My 13" MacBook Pro from mid-2010 (2.4GHz model) suddenly refused to boot up, and shows a white screen on startup.
The computer doesn't give the startup chime sound, there's no reaction when trying the alt key, the shift key, or any diagnostic mode key combination.
Also, I tried starting it up without the HD or the CD drive, still nothing. The only response i can get is from the Intel SMC upgrade system, if the power button is held longer, the power LED flashes.
The Genius Bar told me to replace the motherboard for half the price of a new Mac (!). Any ideas?
I'm suspecting the EFI ROM is corrupted. Would that be possible to reflash? Thank you!
Update (06/24/2015)
The computer seems to actually POST, as it beeps when there is no RAM inserted.
Also, is it normal that the backlight stays on when the lid is closed? The power status LED's responds by turning on when the lid is closed, but the backlight stays on.
Questa è una buona domanda?