Can I have 3 GB of RAM in my Intel Core 2 Duo ..or does it have to be even?

I'm on a MacBook Intel Core 2 Duo 2 GHZ. I upgraded one Ram slot to 2GB and kept the other one at 1GB (as per Tekserve's NYC doing). Now I get a very active pinwheel and very very slow startups. I heard that you have to have even (1 and 1 or 2 and 2) SRAM. Could this be what's effecting my computers performance, or is having 3GB just fine. Thanks in advance.

No you would need to take them out to see who the manufacturer is, it's incredibly easy to do though. Just locate your manual and you will see, if you cannot find your manual it is online at Apple's site:
http://support.apple.com/manuals/#imac
The lengthy start up could be caused by several things one thing to try is a SMC and PRAM reset, the instructions for that are:
1. Turn off your iMac and unplug everything from it for 30 seconds.
2. Plug in the power cord, keyboard and mouse only.
3. Press the power button and immediately hold down the Option, Command, P & R keys until you hear the second gong then release the keys. Your machine will start up normally, then check for the issues you are having.
Regards,
Roger

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