Title says it all. After much experimenting, I found one way to force the wake/sleep problem most MacBook Pro users are experiencing. The problem I'm referring to is the blank/black screen experienced when trying to wake one's MBP from sleeping. My setup: MBP, SR 2.2C2D, 4GB Ram (user upgraded), 120GB HD Conditions: 10.5.2, all updated applied. Fresh restart, PRAM cleared, battery removed & power button held down. Bluetooth ON, using (new) Apple Bluetooth keyboard. Airport wireless ON. No applications running, iStat disabled, screensaver disabled. Steps to force wake / sleep problem: - power up MBP - Bluetooth on, BT keyboard connected - Mag safe power adapter plugged in and connected to MBP - close lid to induce sleep - MBP successfully sleeps (latch light pulses) - wake MBP by pressing a key on the BT keyboard... NOT by opening lid (lid remains completely closed during this step) - apple light illuminates briefly, as if trying to wake, then apparently goes back to sleep - wake MBP by opening the lid, screen is now black/blank... all future attempts to wake MBP results in same black/blank screen and failed wake Key step in the process: - if the mag safe power adapter is NOT plugged into the MBP, and all steps are followed, the MBP will not attempt to wake up when the lid is closed. When actually opening the lid, the MBP successfully wakes. Things I haven't tried: - waking via BT mouse / mighty mouse (I don't have one) - waking via external wired/wireless usb mouse I'll try the wired/wireless mouse options and report back what I find. If anyone wants to try and reproduce this, please post your results (and of course your setup / conditions).