Single Beep, Display cuts out, then comes back

I've had my macbook for a little over a year. Recently the hard drive died. I replaced it, and figured I'd put new memory in it while I was at it (2GB, Samsung). For a while I ran 10.4 (I was on vacation and didn't have access to my external), and everything seemed to work fine. When I finally got back to my apartment and restored my system with Time Machine, things started off well, but then some weird things started happening. First, when I installed new updates, my computer restarted itself a couple times during the installation (after the initial restart), but then stopped, and installation was successful. I figured things had resolved themselves, but then I started getting these weird problems.
When I close my macbook, it goes into standby, but will sometimes start up randomly while still closed. Also, when I go to open it, it will sometimes load, only to cut out again, make a single loud beep, and then come back and boot up fine.
I've read that a single beep usually means a RAM issue, but I'm curious if the problem is maybe with my system, and I should reformat, since it seemed to run fine with 10.4.
Hopefully I've been detailed enough, but let me know if you need more info. Any help is greatly appreciated.

Not resolved!

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