blank screen After reboot!!!

[learner]

HI,
I have a Toshiba a70-rw1, i install windows xp in it with gentoo 2005.1 dual boot. I have this strange problem lately, i restart my computer in gentoo, and the screen went blank, IT DIDN'T EVEN SHOW THE BIOS POST SCREEN. the blue light in the power button is still glowing, and the fan is still running. I give it a hard shut-down, then a power it on again. nothing, same.i do this several times, and nothng happens until i unplug the power cable and plug it back in. then it power on normally. I wonder what could be wrong with it, it don't always happen when i reboot in linux. and it have not happen this way in windows. ANY INFORMATION OR SOLUTION WILL BE HELPFUL, THANKS.
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God says once, " forgive your enemies, and he will forgive you!"

[Catch-22]

If it's not getting past POST I'd doubt it has anything to do with gentoo.

[learner]

that is the same thing i have thought of first, but i try to reboot with windows about 8 times in a series, and nothing went wrong. and when it reboot, i can always hear the same pattern of fan noises that it generates even though the screen don't come up.
_________________
God says once, " forgive your enemies, and he will forgive you!"