Hi there, I have a early 2008 Mac Pro which I have since added a video card, a couple of harddisks and a SDD for boot drive. It has been working like a charm for a long time. From about a week ago, it has started having a bit of a random fit while booting up. When starting from cold, it can do any of the following: (1) Get stuck at white screen with the apple logo (2) Doesn't make the boot sound and all screens stay dark and fans all going (3) Like 2, except the power light is flashing (4) Boots up like normal, then kernel panic (or whatever you call it) within a few minutes (and everything seems to work as per normal prior to the kernel panic) (5) Boots up normally and works normally. Lately it seems to do (4) mostly. The HDD and SSD are ok. I've removed all the USB HDDs too. At first I thought it was the HDD, then maybe I thought it was the motherboard. But now the computer works fine as long as I don't turn it off. Rebooting is a little risky but most of the time it seems to reboot fine. The problem only occurs if when the computer is booting from cold (after being off for a while). Anyone got any thoughts? Thanks!!!