RAM slots not working (lower)

Hi folks - I had a problem with my PowerBook running very slowly. Helpful friends suggested increasing the RAM. When I set about doing this I found that there were two 256 Mb cards in the machine.
I replaced them both with 1 Gb cards and the Mac was back to a speedy machine. Not long after thanking my friends, I got a 'fatal message' telling me I must restart the machine. When I did this there was no 'sueme' sound and I was back to only 1 Gb of RAM. The lower slot was empty according to the system profiler.
I went to bed dejected!
This morning I removed both 1 Gb cards put back the 256 Mb cards and the machine booted up as usual with 512 Mb of RAM.
So I have put back the 1 Gb cards and have a 2 Gb machine again.
Does anyone know what went wrong? Will it happen again? Do I need to have the machine looked at by a specialist?
Thank you in anticipation
Dunc

There is a known issue with Powerbooks with the lower memory slot failing, and it sounds like yours may be starting to fail. At one point there was an Apple recall for a small sliver of Powerbook systems to fix that.
The alternatives are to run with 1GB in the upper slot, try one of the internet vendors that say they can fix that (check references), or install a used logic board. I don't believe Apple is repairing Powerbooks anymore, so if you want to buy a used logic board, you'll need to install it yourself, or perhaps an Apple Authorized Service Provider would be willing to do the work.

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<Edited by Moderator>

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RAM slots not working (lower)

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