IMac recognizes only 256 MB of available 512 MB and freezes

This problem is driving me crazy, I simply can not see any reason for it:
After installing user slot 512 MB memory, my iMac recognizes only 256 MB right (PC133-333), runs for the first time, but after shutdown, it beeps three times and won't start any more.
I have installed in the meantime four different kinds of memory, all of them of the genuine Mac-reseller - so I guess the memory must be OK. Some of them wont work at all, some were shown only as 256 MB (the half).
Couple of weeks before I've installed 512 MB (also 100% garanted iMac-compatible) factory slot memory and this works fine.
Now:
Have I messed up some things by installing the factory slot memory?
What these three beeps mean?
How can it be that iMac recognizes the half memory? If the memory is not right, none should be recognized.
Why did it start for the first time, worked fine, but after the shutdown wont start? Any explanation?
Thanks in advance!
iMac G4-800
iMac G4-800

i think you posted to the wrong forum, if your imac info is right, about the kind of imac you are using, then you are asking in the wrong area...
; ^]
if you are having a lot of issues with memory modules, have you been able to run any of the common utilites on them to verify their status?
do you have any OEM ram, that came with the machine when you bought it?
does the same problem happen with that ram? if true, then you may need to have the machine looked at in a shop.
if your machine is ok with the OEM ram, then find a different reseller. also, i hope there wasn't any static discharge when you went throught the ram installation process.
where, exactly are you getting the data from, about the ram module capacities?
the about box? or system profiler?
and you are positive about the ram specs for your machine vs. the ram you are trying to use?
what is the age of your machine? have there been any other user modifications?
any additional periferals?

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