View Full Version : Powermac dual 2.5 blank display

Mar 10, 2010, 11:45 AM
I would be very thankful for any help on this

My late 2004 G5 dual 2.5 is misbehaving. It was working fine, I left it in the box before selling a couple of months ago and have decided to keep it now, but when I switch it on it powers up but the display screen is completely blank, black.

I've tested the hard drive, the ram and the screen, all no change. I have tried to use it as a target drive using firewire to a macpro with no success. I have taken out and refitted the graphics card


same story.

It starts up and then the fans go a bit mental and I have to switch off.

I'm stuck, could anyone give me a hand, do I need to replace the graphics card, if so what is an inexpensive option.

Thanks in advance

Mar 10, 2010, 05:50 PM
I might sound like a broken record, but...

Check for coolant leaks. Thats what I thought was wrong with mine, because it sounded to start up just fine, beeps and buzzes, HD's spinning, I just wouldn't get any video. I was just about to go on eBay and buy a new graphics card when I noticed some yellow fuzz underneath the processors.

Panic ensued.
Apple repairs free of charge.
Called Apple.
Repairs didn't fix it, or they couldn't get all the parts they needed.
Got a free Mac Pro

Mar 11, 2010, 02:51 PM
Its the graphics card or the driver for the card. Lots of times it just needs to be reseated.