I've recently noticed that my cMP (4,1->5,1) occasionally restarts upon wake from sleep (logs indicate something perhaps related to the video card—a flashed Maxwell card), and I thought that it might be a good idea to run the Apple Hardware Test (AHT). Unfortunately, the test hangs almost immediately during the initial probing phase. In the past, before having flashed and upgraded this machine, AHT has worked fine. I've tried putting back the original memory, original video card (GT 120), and taking out all of the disks, including my PCIe SSD. I also did both SMC and PRAM resets. Still, the test hangs. Does anybody know if a flashed firmware or upgraded CPUs (two x5680s) can cause AHT to hang like this? Would the hanging be related to the restarts?