My server decided to die on me. Two of my hard drives failed at the same time (luckily on different raid arrays) and since they were on the same raid controller, I reached the logical conclusion that the raid controller was dead. I bought another one at a local computer store for way too much money, and it didn’t work. The Linux kernel would hang during boot; not a kernel panic, but a hang. At this point I started to think that it was a software problem because both raid cards used the same chipset (VT6421). I downgraded 2 kernels and tried to boot again. This time the computer would boot and see all the hard drives, but after a couple of minutes, the computer would become unresponsive. After a couple of days of testing in my limited amount of spare time, I decided that at least 1 PCI slot on my motherboard is dead. Now it’s back up and running, hopefully for a long time.