T400 does NOT wake up after going to sleep

T400 does not wake up after going into sleep. It goes to sleep ok but everytime wheni try to wake it, it restart the whole system instead of waking up.
I have checked the BIOS Security setting and it already set on Active. All drivers are upto date.
Please help!!
Message Edited by farooqjilani on 03-09-2009 08:23 AM

I have a similar issue with a T400 (xp sp2).
suddenly, it won´t come back from sleep.  i have to press & hold the power button to turn off the computer, and then press again to turn it on from scratch.

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