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Laptop crashes with external display, No BSoD
My work laptop, an HP 8560p, crashes after a period of time with an external monitor connected to it. Crashing can occur anywhere from a few minutes after rebooting to a couple hours after rebooting. There is no BSoD when the laptop crashes; the laptop just shuts off and automatically restarts. I have not been able to replicate this issue without an external monitor plugged in. The issue happens with the external monitor plugged in via direct to the laptop or through the dock; VGA or DVI.
So far I've tried:
A clean sweep of the video drivers and testing both the windows display drivers and the ATI drivers.
Sending the laptop to HP, where they completely replaced the motherboard.
Currently running memtest86+ (currently 2 passes through without any issues).
Does anyone have any ideas how to accurately diagnose this problem?
System Specs:
Win 7 Pro 64
Radeon HD 6470M
4 GB DDR3-1333/PC3-10600
i5-2520M
500 GB hdd