Whenever my Dell Latitude D520 Notebook is cold (40 degrees F or less) it comes out of standby running VERY slowly. Also the cooling fan comes on, which it rarely does even during normal, warm operating conditions. The problem does not correct itself as the comptuer warms up. The fan stays on and the computer runs slowly until I restart, then it's normal again, even if the computer is still cold. If it was turned off and I turn it on while it's cold, it runs normally - this ONLY happens when cold and coming out of standby mode.
Dell's solution to the problem: don't put it into standby if it's going to get cold. hah.
I have already reinstalled Windows and have already replaced the hard drive, neither of which solved the problem.