Wholehog III problem... Help me please!!!

i have a problem with my console hog3, the problem is when i try to turn it on
the screen don't start always are in black, don't turn on, after seconds the choose keys
start flashing like 3 time quickly and then repeat the cycle, after 30 min the screens turn on
and everything is normally but then when i try to turn it on again happen the same thing, and now
even wait 30 minutes or more dont start the screens... do you know about this problem?

i tried to change HDD, Ram memory, add an external monitor for VGA, IDE cable... any solutions?? thanks
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