One way to fix computer lockups

Back in October 2003, my computer began locking up for no particular reason. I had been using Linux for years already, and since I hadn't changed any software recently, this struck me as unusual. I thought it might have been the Linux 2.6.0-test9 kernel, since I was trying it out. I went back to the 2.4.22 kernel, and the problem kept happening. I pulled out all the cards, reset the BIOS parameters to their safe values, and disabled DRI in X, but nothing fixed it. It was down to the video card or the motherboard. I wasn't sure which one it was, but after it locked up again, I turned it off in disgust and began extricating the motherboard, assuming I was now in the market for a new one. I took a good look at the motherboard once I got it out, and it was at that time I realized what the problem was.

CPU capacitor Near the CPU

Memory capacitor Next to the DIMMS

D'OH! Three capacitors had expanded and leaked onto the motherboard. I figured at the cost of a new motherboard and memory (since my SDR SIMMS wouldn't work in a new DDR motherboard), it was worth taking the chance and replacing these parts. Since they're fairly low tech, the risk of damage to the replacement capacitors or other parts on the motherboard was acceptable compared to the cost of new hardware. So, armed with a soldering iron and desoldering bulb, I took out capacitors for the CPU, memory, and the northbridge.

CPU capacitor holes CPU capacitor removed

Memory capacitor holesMemory capacitor removed
notice the dried electrolyte on the board

Northbridge capacitor holes Northbridge capacitor removed

Getting them out was easy enough, but Radio Shack didn't stock suitable replacement parts. I took a long lunch and drove down to the French Quarter to one of the local supply houses and got new ones. Not a perfect match, since the ones that came out were 6.3 volt and the replacements were 10 volts, but close enough. I was more concerned about size more than anything. A little tight, but OK.

New memory and northbridge capacitors New memory and northbridge capacitors

Old capacitors Old capacitors

It looked like it should work, and there weren't any complications during the operation, so I put it all back together and lit it up.

Hurray! A successful POST! And it boots too! And no lockups since! For less than five dollars worth of parts, I saved myself a few hundred. And since you are reading this, it must still be working as it is now my home server.