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I have a Compaq desktop and tried to install additional memory and after installation I get the message "operating system not defined". There was already a 64mg sim in and I was installing a 256 sim. I checked all of the connections to make I did not loosen anything while installing the memory. When I turn it on the compaq screen comes
up and it counts the memory, it recognizes that the memory is being updated and then the above message comes up. What steps do I need to go through in order to have the system see the hard drive again?
 

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Hi jmheat, welcome to TSG....

Take the new chip back out and try restarting again. If the computer starts fine, either you are putting the wrong memory (Compaqs are famous for this) or your system doesn't support that much memory.
 
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