The amount of ram for g4/800

ok so i took my g4 imac to our local mac shop, and tried to get up to 1gb of ram, when i went to the "about this mac" it said it had 512mb so i had to get another 512mb for 1 gig. no big deal. so i go to the store and when i get it back it only has 768mb, and they said it really only had 256mb of ram for some reason. and they said you cannot get 1gb of ram. is this true? ive been looking around these forums but nothing seems to clearly answer my question?

Hello and Welcome to Apple Discussions. 
The iMac G4 is a funny beast when it comes to RAM. There are two RAM slots one called "user-accessible" and the other "factory-accessible". Apple installed all the RAM originally ordered in the "factory-accessible" slot so you would have 128MB, 256MB or 512MB installed in there.
The "user-accessible" slot would be empty for users to upgrade at a later date.
Click to enlarge.
I suspect that you had a 256MB in the 'factory' slot and a 256MB in the 'user' slot when the shop upgraded they only replaced the 'user' with a 512MB to give you that 768MB total. For anyone who knows iMac G4s, upgrading the 'factory' slot is not difficult I took the photo above for example.
I hope the store didn't charge you a fitting charge for the user-slot installation and it's a two minute job that anyone is capable of. The factory slot installation is probably a thirty-minute job and is more complex.
To confirm my suspicions have a look in  menu > About this Mac > More Info...:
Check you have a 256MB and 512MB.
cheers
mrtotes

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