Hey guys, new to the forums here. Done my fair share of reading but never any posting. I'm really hoping someone can help me here. I'm about to go insane! This may be a long story so please bare with me. I'll thank you in advance for your time. I have a mid 2010 Mac Pro 2.93 12 core. I use this machine to run my music production studio and it works great...until recently. About a month ago I noticed it after sleep mode I'd wake it and it would be frozen. The screen saver would go away and reveal my desktop as normal, my mouse would move (sometimes erratically), BUT it had frozen completely. I have to hard restart EVERYTIME. Sometimes the screen would look glitchy/spotty/pixelated. Originally I chalked this all up to the original boot drive going bad after 5 years of use. So I replaced it, reinstalled 10.6.8, restored from my latest backup but still it freezes after sleep! Can't be software related cause I essentially restored this thing down to default factory settings and hardware. I've taken it to the Apple store 3 times and no one knows how to fix this. They ran the hard drive diagnostic tests which they all failed because they're not licensed Apple drives (still WD or Seagate). They have no idea how to fix this. Here's a list of steps I have taken to resolve this: -Repair disk permissions -Reset PRAM -Reset SMC -Clean install of 10.6.8 AND 10.10.2 with no additional software -Removed all other monitors -Removed external drives and devices -Removed 2 additional internal drives -Removed 3rd party RAM -Ran extended AHT (no errors) -Unchecked "put hard disks to sleep when possible" I've seen many posts like this but nothing quite as far gone with all the steps taken to resolve it. PLEASE HELP! THANKS!