A few months ago, my computer started freezing up completely for no apparent reason. It happened originally in Microsoft setup programs in Win95, and in Word97 in NT4, and on boot up in Linux.
After several days of trying to solve this, I disabled the CPU internal cache in BIOS. The system no longer crashed, but ran like a 486 (It's a P150 with Gigabyte HX motherboard, Grafixstar 600 and 32MB RAM). I then sent the CPU away for replacement, thinking the cause to be a broken cache. The replacement did the same thing.
The next thing was to UNDER-clock the CPU to a P120, thinking that if going slower made it work then this might be a good test. It does work now, but at P120 speed, and with occasional lockups in:
Duke3D and Blood setup
Doom won't start in Win95
Also, I bought a new modem yesterday. It's one that takes processing power from the CPU, so is about half the price. It works fine on a friends machine, but on mine, when I boot up with it in, the screen stays blank, with not even the monitor power light on. The system does the self check and then stops, from what I can tell from the disk noise.
As it stands, the system is usable, but slower than I'd like, and with some irritating habits. And I can't use my brand new 33.6K modem either, so help would be much appreciated.