computer constantly locks up

This is not much info to diagnose with but for starters...
When you replaced the MB did you replace the processor? If the processor has a problem, overheated, etc this could do it.
Another thing to check is the connecting cables for the drives.Try disconnecting the CD drive and see if this stops the lockup. If so, replace the cable first, then the CD drive. Hope this helps

If you want to limit the possibilities of hardware involvement try this:

1 Remove all cards from the system except the video card.
2 reboot and see if that has stopped the error
3 if it has stopped the error then replace the cards one by one until the error reappears and that will tell you which and if it is a card.
4 if it did not stop disconnect cdrom drive and fdd from systemboard and reboot
5 next remove either the keyboard OR mouse(you will need one or the other to function within windows)
6 remove all peripherals from systemboard (printers, scannners, cameras, etc.

keep removing things until all you are left with is the hdd and either mouse or keyboard and processor and memory then probably the load of windows was corrupt. wait until the very last thing to reload windows

hope this helps

When you did your restore, did you restore from tape, or reload things from scratch. Windows, especially the earlier versions of 95, accumulate garbage, and often something bites you today which is the result of something you did a month ago.

Here is the way we would handle this in a corporate help desk setting. Note that this approach assumes that the hardware is much less likely to be the problem than software, and that we want to spend just enough effort to fix the problem. After each step check to see if the problem has gone away, and stop if it has.

1. Ask what changed in the last 30 days, and reverse it. If it is not your own machine, keep asking until the user tells you.

2. Try a registry cleaner. (regclean.exe from the Microsoft site, for example). Sometimes, but not often, this clears the problem.

3. Pull a list of all files modified in the last 30 days ("find" command). Look for programs that have been installed, especially games. Uninstall these if possible.

4. Reinstall the operating system, then reinstall all service packs and patches.

5. Uninstall then reinstall any software that seems to be having a problem. If on NT, reinstall the service pack, on Win9x, reinstall critical patches after you do this.

6. Via software, remove all non-essential devices, reboot and reinstall them (and reinstall the drivers).

7. If you get this far, time to start suspecting hardware. Remove all cards from your system which are not necessary for boot (removeall sound, network, scanners, etc.) See if this gets rid of the problem. If it does, add them back one at a time until the problem reappears (if it does). Replace whatever hardware caused the problem.

8. Hopefully you won't get this far. Give theuser a new computer and work on the old one in spare time. If you fix it, it becomes the next computer to go to a user.

Good luck.

After replacing the Motherboard,did you you update the drivers to your Bios and the Video Card,which will cause system lockups,then you will need to check your memory seating and make sure you have the correct type of memory,recheck all cable connections,also check to see if your CPU is operating properly and the fan is turning when you boot the machine up.

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