I had a Mac that was crashing on boot to a perfect BSOD. It was running SL. Was an iMac which had been running 24/7 for 8+ years. I decided to format and reinstall so I could give it away clean. Installation was normal but when it booted up to the welcome animation, it would get about 10 seconds in and crash to a BSOD, the exact shade of blue that Windows had. Never did get it to work after several reinstalls. Finally tossed it.
6/26/15 at 1:46pm