yes i have reseated the ram.slot zero ram was bad so all ram are in new positions.Then after more crashing i moved ram from slots 0, 1, 2, to slots 1, 2, and 3.since then crashes taking longer and not as frequent.Also disconnected a couple of hard drives to rule out power supply failure.Coming to the conclusion it is either a problem in the motherboard or the windows installation has gone bad.It will crash not always after resuming from sleep.sometimes takes up to 10 minutes or longer.