When I try to enter standby or hibernate, my dell latitude will freeze up on either the preparing to hibernate screen (for hibernate) or with a black screen (for standby), while keeping on the system and fan, and the power light stays on, and the wifi light stays on. the only to get the system to respond is to hold the power button to do a hard shutdown and turn it back on. I tried system restore and it fixed the problem for one standby cycle, but now again i cannot go into standby anymore or hibernate. any help is greatly appreciated. THanks!