Computer Beeps and loads into open firmware

Hello there!
I've been having this beeping problem intermittently for some time now. Randomly before the startup chime I would hear a single beep from my computer before it restarts and loads normally. According to Apple.com/Support it is a memory problem, I didn't give it much thought since my chips are from my brothers QS2002 G4 1) preinstalled 1) purchased from the Apple Retail Store the computer was purchased from.
Well I popped open the case recently and noticed there was a strong collection of dust around one of the banks (lacking an air can + my vacuum couldn't get to it) I just moved the chip to the opposite bank. Problem Solved! Right?
Not! Last night my brother cold booted the computer and I heard from the kitchen the same beep plus this time it booted into open firmware.
So could this be a problem with my logic board? The Apple Speaker sound port is damaged but I believe it should not affect the rest of the board.
PM G4 DP 800Mhz 256Ram ~80GBHD Mac OS X (10.4.9) 2 xtra 512 ram chip, remvd 256 chp. Maxtor 200gb Ext FW H.D.

Just wanted to update this post with the current status.
I ran all the tests I could think of (TechTool, Apple Hardware Test) several times with all of the hardware tests passing (the software ones said that some of the bundles of custom/noncustom icon bits were on/off but I used to receive that message thousands of times with Norton back around the turn of the century.)
While I personally have not heard any tones or seen it boot into open firmware my brother says it still doesn't that randomly and intermittently at times.
I'm not going to bring it to my Apple Store since if I can't find anything wrong then they probably can't either (that plus I don't want them charging me upwards to a $G for a new logic board "just incase that might be the problem" or not.)
I'm going to leave this post open until further notice ("just in case" I find something else that is causing it, "just in case .
QS2001 PM G4 DP 800Mhz 256Ram ~80GBHD Mac OS X (10.4.9) 2 xtra 512 ram chip, remvd 256 chp. Maxtor 200gb Ext FW H.D.

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http://discussions.apple.com/thread.jspa?messageID=6115258
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