Even the slightest bump on my Mac Pro (early 2008, 8 cores, Xeon 2.8GHz) causes it to: - screen goes black - All fans wind up to max - system becomes complete unresponsive, including to remote access (no ping, etc) Restarting generally makes everything ok (but you have to hold power button for 5s or so to get it to power off), though this morning it failed to start a couple times too; just went straight to fan madness. This actually happens without bumping it as well on and off, but bumping it is pretty reliable. I've - re-seated all memory. It kept 'forgetting' about some of the memory in Bank B, so I pulled all of it (down to 8GB now, dammit), it no longer forgets any of the installed memory but the problems continue and are getting worse. - re-seated the video card - Blew all the dust out Any ideas?