Exactly what the title says. I installed 10.5.2 on a 2.2ghz MB and when I restarted it, it didn't restart. The screen didn't come on and it gives 3 short beeps, 3 long beeps, and 3 short beeps - S.O.S. The sleep light also blinks with the beeps. It is really weird. I think it's kinda funny cause it's S.O.S., but not good because it won't start at all. It won't recognize any keyboard commands on startup (T for target disk mode, C to boot from the optical drive with Leopard DVD, Shift for safe mode, etc.), and the screen doesn't come on at all. I know three beeps means bad memory so I checked it, and it is good. I took the memory out of my 2.2ghz MBP and put it in the MB - same thing as before. I put the memory from the MB in my MBP, and it started just fine. I already called Apple and they are sending me a box. I figure it is the logic board. What about everyone else?