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PC inexplicably going into Sleep mode after Media Center initialized
I have a 32 bit Windows 7 Lenovo Thinkpad L412.
In the past few weeks I have re-imaged my hd to factory state (as I do often).
After a few days it begins to go into sleep or stand-by mode after being left idle for around 5-10 minutes. It does not turn off, or actually hibernate, it simply goes to the user log-in screen prompting for a password to return to the desktop.
I have no idea why. I am not a noob or anything, I have checked the power options, and power manager and changed all settings for sleep/hibernate/standby to never, including the power plan I am on.
I can find absolutely no reason why it is going to the log-in screen.
HOWEVER, I think it only starts doing this after I have opened and set-up Windows Media Center. After putting my TV tuner in via USB and setting up my TV in windows media (which works fine), the comp begins going to sleep after 5-10 minutes.
It will do this indefinitely, even if I take the PC tuner out or close WMC, or restart.
HELP?! This is unbelievably frustrating I cannot believe I can't figure this out.