I picked up a 2010 dual 4 core tower a while back with the intention of upgrading it over time. I just "finished" upgrading the CPUs to dual 6 core and it's stuck on the Apple Logo screen. From what I've seen on line, this is a "good sign" since it booted this far. Looked at the verbose mode output, it freezes after the "End RandomSeed" line. I'm not sure where to go from here. Seems like the CPU and Ram would be tested prior to the chime. What should my next steps be?