G5 Logic Board or Memory Issues?

Hello, about 2 months ago i recieved a 1GB Dimm for christmas, and being naive, i installed it in the slot above the 4 512MB RAMs that came with my computer. When the computer didnt recognize it i looked in the manual and found out that you are supposed to install them in matched pairs. Figuring i would lose the memory i left it in the computer for about a month. Then the trouble started. When waking from sleep or screensaver i would get the spinning color pinwheel which would NEVER stop and i would hard start using the button on the front. Problem was that the computer would not boot back up for hours. I would get to the grey apple screen and then after that a blank blue screen with the cursor, and that is as far as it would get. If i tried hours later it would eventually start up. When i decided to remove the 1GB RAM chip the computer worked for about a day then started the same problem. I wiped both my drives to zero and installed the system on my second drive. Again it worked for a day and then the same problem. Once the problem started it hasnt stopped yet, i cant get into my computer at all now and it has been several days. It wont boot from ANY volume. I brought it into Tek Serve in NYC and the said it could be the processor or logic board, but they wanted 700-1000 dollars to fix it. So i took it home and ran the apple hardware test cd. I ran the extended test first, then the quick test. Both times it said my logic board passed, harddrives passed, but when it got to the memory section it took a VERY long time, and eventually CRASHED my computer the screen turned into millions of bright colored bars and i would have to hard re-start it. Thinking it was bad RAM i removed all my RAM, and re-installed it in different orders and taking my computer from its factory 2GB down to 1GB to see if any of my chips had problems. I also hit the reset button under the RAM but it still never started and still had the same problem. So as of now i dont have a working computer, i called someone at apple tech support and told him the whole story. He said i should bring it it somewhere and maybe by putting in the extra mis-balanced 1GB chip maybe i overloaded my RAM sockets and fried that section of the logic board. Has anyone heard of this happening? I am reallly lost on this whole thing and would rather not pay $1000 to fix it (though i think maybe Tek Serve is just really expensive), but obviously a comparable new mac is 3x that amount anyway. PLEASE let me know if there is anything else you can think of, or let me know if i could have maybe infact overloaded my RAM and blown the logic board.
g5 dual 2.7   Mac OS X (10.4.8)  

You can go to the Apple Support page and click on Check my Warranty, then enter your serial number (found in "about this Mac">more info) and you will see how long you have left on your Apple Care.

Similar Messages

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    can u explain me what is the MLB? is it the motherboard?
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    http://img169.imageshack.us/img169/7888/dsc03013mx3.jpg
    http://img175.imageshack.us/img175/7905/dsc03014tf5.jpg
    http://img175.imageshack.us/img175/5957/dsc03015qk8.jpg
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