Emac still freezes

My emac was freezing up, I learned I had bad caps, I took it to the apple store last fall, and they replaced the board, However, my emac continued to freeze up. I recently bit the bullet and did a clean reinstall of the operating system and everything. It operated great for a week and a half until it froze up again. It has happened another time since then. Any ideas on what I can do to solve this, or is it hopeless?
It is a 1.25 Ghz, USB 2.0 Emac running System 10.3.9 with 1 Gig Ram--a 512mb chip running at 2700U-25330 & a 512 chip running 2700U-30330, plus a 232 gig hard drive.

Hey Glenn,
Is there any way to tell if a RAM stick has problems?
Not that I know of. I had a Quicksilver in the shop that kept kernel panicing. I finally had to pull all the RAM out of it and add it back one at a time using known good RAM as a base. I'd run the machine for hours at a time until I finally identified one bad RAM stick. Took 6 hours.
I will look at the capacitors later today. Have you heard of anyone getting bad capacitors on their logic board that was replaced by Apple?
No but I suppose it's possible. There were a lot of bad caps out there during that period. We have 7 Dell boards with 12 bad caps apiece.
Richard

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