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Mike
Mike, Mac Support Specialist
Category: Mac
Satisfied Customers: 2186
Experience:  Apple trained Technician, A+ Certified, 20+ years of Mac support, repairs, training, and consulting
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i got a power mac g5 off ebay the other day. i worked fine

Customer Question

i got a power mac g5 off ebay the other day. i worked fine friday night. came back sat turn it on and now i have a blank screen . the computer boots up. and running just a blank screen. please help
Submitted: 8 years ago.
Category: Mac
Expert:  Mike replied 8 years ago.
Hi,

It could be you need a new battery on the logic board.

Let's reset the hardware and try to get it squared away.

Do this:
To reset PRAM:

Turn off Mac

Find and hold down the following 4 keys at the same time:
OPTION
COMMAND
P
R

The command key is the Cloverleaf/Apple key.

Turn on the Mac while keeping the 4 keys held down.

Wait until the Mac chimes 3 times, release the keys and let the Mac boot normally.
Then....

To Reset Open FirmWare (PowerPCOnly)

Turn off the Mac

Find and hold down the following 4 keys:
OPTION
COMMAND
O
F

The command key is the Cloverleaf/Apple key.

Release the keys when you see the text screen

Type the following exactly, press return after each command:

reset-nvram (press return)
reset-all (press return)

The Mac will restart on its own.

Let e know if this helps. If not, then we'll move on to other tests.
Mike
Customer: replied 8 years ago.
did not work. the screen is still blank. Mac boots up fine
Expert:  Mike replied 8 years ago.
OK.

What type/brand screen do you have?

Is it connected via VGA or DVI or how?

Have you tried to disconnect and reconnect the cable?

Have you cycled the power to the display only?

Mike
Customer: replied 8 years ago.
apple screen.and it is DVI. and i have not cycled power to the display only
Expert:  Mike replied 8 years ago.
Ok,

Here is what I would try in this order.

Turn off the display. Unplug from the Mac.

Turn it back on and let it go to sleep.

Connect it to the Mac. Turn on the Mac.

Does it come back on?

If not, then open the G5 side door and remove and replace the video card (after removing cable from rear of Mac). Then power up the Mac and Display again.

Does it work?

Let me know,
Mike