It is quite common for a system to hang on RAM that is not quite fast enough for the system, and the hang point can indeed be random. Sometimes the OS has to boot, sometimes it will hang in the BIOS.
If one of the two original RAM chips was bad, I would strongly doubt the other one. Remove it and just run with the new RAM, see if that solves the problem. If so, get faster RAM.
If you have a fast motherboard chipset like an Nvidia chipset, they need RAM with CAS LATENCY at 2.5 -- if you use CL3 ram, it is too slow for the MB chipset, and it will cause all kinds of boot problems. Even RAM testing apps do not test the problem that the Cas Latency of the RAM is marginally too slow for the chipset.
If you can test the RAM issue first by only using fast RAM of CL 2.5 -- then if that doesn't solve it, yes it is most likely to be the motherboard. However, try Punky's suggestion of a general test before giving up on the motherboard.
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by: PUNKYPosted on 2007-05-13 at 10:18:05ID: 19081582
It could be several issues such as power supply, memory, and yes possible the motherboard that aging. You can download utility tool ubcd and test overall system see if you can get any error message indicated possible issue. It is long shot, and you might also consider new system that helps to save time trouble shooting this.