Can not wake up normally after sleeping too long

G5 with 23inch cinema LCD, Geforce 6600LE video card
if only sleep within 1 hour, it will wake up normally by moving mouse.
if more than 1 hour, the desktop will show but just last 2 seconds. and the display turns dark for 10 seconds and turns blue for 2 sec. and goes dark and repeat the cycle. finally stays dark.
checked this board. It seems not a single case. Anybody has any idea about this? thx a lot.

I have the same bloody problem. It started with my upgrade to Leopard. Short sleep is ok - wakes up alright. Longer sleep - comes up with black screen and roaring fans. Well done, Apple. Now I cannot and will not upgrade my laptop as a laptop that can't wake from sleep is about worthless.
I have: tried pulling the SystemConfiguration power management file out and restarting - didn't fix it.
I have also cloned my hard drive, erased and reinstalled Leopard, and restored the files and then installed all updates - and now I am back where I started, with black screens and roaring fans after restart (did the same thing before upon safe restart with shift key down, and also on single-user reboot after I started fsck (the roaring fan part, not the black screen). This counts as a major bug.
Other discussions suggested a problem with graphics drivers missing in Leopard, or perhaps unchecking the 'sleep disks when possible' option under the energy saver as a temporary workaround.
My laptop stays at 10.4.10.
Brian

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