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My mid-2012 Mac Pro will start up andchime but won't boot. Apple would not allow me to get a warranty protection. I've unplugged everything. Attempted a restart. Won't even let me boot my recovery drive. Is it the power supply?
a Mac that starts up, turns on the fans, and chimes is working. It does not need a new power supply.
what appears on the screen, if anything?
Vertical lines. Doesn't matter which monitor I use.
I would remove all drives and all PCle cards except graphics card, disconnect all peripherals except mouse, KB, monitor and see what happens.
This assumes you have a Mac flashed graphics card like the one that initially came with the Mac.
Didn't work. Graphics card is the original one that came with the Mac
Do you have another Mac? If so you can connect the two via FireWire and boot the 2102 MP in Target Disk Mode
http://support.apple.com/kb/HT1661
and see if you can access the disk I the 2012 MP
Try reseating the graphics card and the power supply connection (both ends) form the AUX connector on the logic board to the graphics card.
Does the fan on the graphics card work smoothly?
Maybe a bad graphics card.
persistent vertical lines are an indication that the display RAM on the graphics card has failed.
It may be time for a new Graphics card. this article points out the pitfalls and restrictions, but there are a few more cards available at the high end now:
User Tip: Mac Pro silver tower (2006-2012) Replacement Graphics cards
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My mid-2012 Mac Pro will chime but won't boot.
