Hello, just last week my new MBP 15" i7 2.3 GHz, 8 GB RAM arrived. I am using my MBP very much "stationary" so attached to an external display using the Apple Displayport to DVI adapter. Every time I have to reboot the MBP (let's say after SW upgrade), the MBP will boot, come to the blue screen and then the build-in display (and also the external) stay dark and it looks like the MBP is in nirvana. The only solution is to switch off the computer by pressing the power on button. Sometimes this also happens during normal boot as well. However, the external display is not attached everything (means every boot or re-boot) works fine. Anyone having the same experience ? Thank you!