A shot in the dark, but three things I can think of:
1. The humming sound you hear may be a failing processor fan.
2. Another possibility is that power connector's wires touching the fan blade and thus not allowing the fan to reach its full RPM.
3. You might check to see if the processor fan has come loose during your move. This would keep the fan from making the proper contact with the processor core.
In all three scenarios, if the processor fan is not working properly, your processor will overheat. I can't remember if the Pentium III has over-heating (thermal) protection or not, but if it does, it will reduce its speed from the full 2800 MHz to <literally> a crawl.
If you are experiencing crashing problems, I'm pretty sure that your proc is overheating. You might make sure the memory modules are seated properly.
Hope this helps.
Running a Dell Dimension with a Pentium III, 2800 MHZ, added HD of 160 GB, 512 RAM.
Anyway, for almost three years this computer has run fine. My harddrive melted down at one point and had to be replaced about 18months ago, but no issues since.
Recently I went home from school and took my comp with me. When I got home I noticed it was running slower than usual, but I thought it might just be my perception or that I was connected to the internet when the computer was ready to be on a LAN like at school.
Anyway, after a month at home and now a day or two at school with internet, I am sure neither of those are the problem. Here's what happens:
Boot-up takes about 5 minutes, sometimes more, just to get to the Windows XP log in screen. From there it takes 2 more to get to the Desktop. Usually this would take no more than 2 minutes combined. I have noticed a new (and weird) screen when booting up too. After the "Dell" load screen with the small black bar that turns white, the screen goes black and a white load bar appears along the bottom that takes about 10 seconds to fill. Then it goes to the normal WinXP boot.
Once running, the computer seems to work fine, but is sluggish and sticks in places it normally wouldn't.
No HD noises, but the entire system does seem to 'hum' a little more than it did before. Even when not doing anything, or after sitting for hours without any programs running or anything, it will still be a little sluggish.
Anyway, that's the whole story. I've tried all different kinds of solutions that I know of just to keep XP running smoothly (freeing up HD space and clearing processes), but with no luck.
Any and all help is appreciated!