Temps seem fine. I am leaning toward Internal CPU PLL enable + sleep/hibernate issue. Go into MB bios and Advance Mode. Going from memory, Internal CPU PLL should be under "AI Tweak". Disable it, reboot into Windows and let it sleep. Then, try to wake it up.I have it so it goes to sleep after ten minutes.
I'm not overclocking it. Yes, I"m letting the computer go into sleep\hibernation mode after leaving it idle, but no overclocking at all on my end. I don't even know how to do that.
I still have Prime95 running, and here are the current readings:
And, with 2500K, you really should be overclocking it to 4.4-4.5GHz. There are plenty of guides around showing how. Most will have you enabling Internal CPU PLL, but you can disable for 4.5GHz and below.