iBook stopped recognising ram

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I bought my iBook just before christmas with an extra 512 mb RAM installed, so this meant i had 768mb.

I've just looked, as the computer was running slowly, and its now saying that I only have 256mb. Its stopped recognising the extra ram. Any ideas why? and how can I fix it?

I'm not sure exactly what ram it was, as I didnt install it myself, but the box says:

512MB PC2100 SO-DIMM DDR266

Any help?
 
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Mac Pro Quad Xeon 2.66GHz 3GB RAM, G4 Quicksilver w/Sonnet 1GHz Encore ST, 1ghz G4 Powerbook
Have you tried reinstalling it?
 
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Thanks, I'm just having a read of that. It seems pretty straight forward.

Without the extra ram all my music software is running pretty slow at the moment.
 
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Here it is…
You probably got the instructions to install the ram when you bought your computer. (maybe in a pdf). If not, go here and download the pdf for your iBook. The actual ram install instructions begin on page 55. Real simple to do.
http://docs.info.apple.com/article.html?artnum=50014
 
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Thanks alot. Do you reckon I should take it out, then restart the computer, then put it back in?
 
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That might just help if you reset the pram when you restart.
Remove the ram and restart holding down the Apple+option+p+r keys

The computer will chime. Continue to hold these keys until it has chimed three times. Then release. Once it has started, do a shutdown and install the ram.
 
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Everything is good now. I took out the ram and then restarted.Put it back in, and it then suddenly worked. I have no idea what can have happened before.
Thanks, immdb
 

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