Screens go black, won't boot.

I have a Mac Pro (3,1) with 8 gb ram, 2x2.8 Xeon processors, GeForce 8800 ( I think) video card. Two Cinema displays.
A couple of nights ago, after working a short while, both screens went suddenly black, with their little pilot lights on; the power light on the MP was also on. For a while, a restart would fix the problem, but after several minutes of working it happened again. Tried unplugging and zapping pram which seemed to cure for a couple of days. Last night it happened again and nothing will bring it back-it immediately goes to the black screen with lights mode (I do hear a startup chime, but see nothing). Any help would be greatly appreciated.

Along with basic system maintenance, repair, monitor temps, watch your system profile: memory for errors; and, boost the fan rpm from default to 900 rpm for those that will.
FBDIMMs should be 60's C. or 140's F. and can always benefit from extra airflow
to rule out adding one problem on another, consider installing OS X on a new drive and pull the old one to see if it still exists.
and run Apple Hardware Test .

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Hi Guys,
My macbook is driving me insane now. Just recently, my macbook has occasionally flickering screen and freezes after that. Yesterday, when I was watching youtube on fullscreen, it first has flickering screen, then freezes. So I hard booted it pressing the power button. Then, when I try to restart it, it won't boot pass the apple logo no matter what.
Here's my macbook spec
2007 Summer Macbook Pro 15"
Snow Leopard 10.6 OS X
I cracked my screen once, and got a replacement, don't know if that matters.
I've tried the following:
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Booted in verbose mode but it gives a warning message:
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I've tried everything I can find online short of opening it up and send it into the oven for baking! I pray it's not a hardware problem, coz I'm no good at that. (QAQ~~~) Please help me!
Thank you very, very, very much!!!
ps. this is my first post. please let me know if I have missed anything.

starangelam wrote:
When I try to reinstall Leopard OS X 10.5 with installation disk, the macbook seems to try to read the disk, but won't boot. I've got a CD stuck in the optical drive now.
Reboot the machine holding the trackpad or left wired mouse button down, that shoudl force eject the 10.5 disk.
Reinstalled Snow Leopard OS X 10.6.
This time it booted with Finder and everything for a short while, then the screen flicker and freezes again (before I can backup anything!). Then, I can't reboot pass the apple logo again.
Ok, so your attempting data recovery efforts.
First get the 10.5 disk out of the machine, like above.
You can also boot into Single User mode, (command s at reboot) and enter
/usr/bin/drutil eject
then type
restart
Next hold c boot and use the 10.6 disk and create a data recovery drive here on a blank external drive, make sure you clean and polish the bottom of the 10.6 disk, if it's bad you will need to get a new one.
Create a data recovery, undelete boot drive
If your problems continue on this drive even with a clean or new 10.6 disk, it's likely a hardware issue with your Mac, not a issue with the drive.
I suspect a failing sector on your internal boot drive, you installed OS X right over the same spot perhaps, as you were obviously able to boot from the 10.6 disk to install it so it seems the hardware of the Mac appears to be working.
You might have other issues relateing to software perhaps, something your installing or running.
Step by Step to fix your Mac
Once you have gotten your files off the internal drive, you may want to look into doing a Zero Erase with Disk Utility before resintalling 10.6 again fresh install method.
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Greetings,
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gwgoodlow wrote:
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Hi,
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This happens totally unpredictably, only thing to do is force quit by holding power button.
I saw the thread below regarding "...dont wakeup after sleep". This is not the problem here, the computer just turn black screen during work.
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Screens go black, won't boot.

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