Imac late 2006. Is it my logic board?

Ok so I tried everything and its about to be a year. so ill just start from the beginning so around this time last year I Believe it was on Christmas eve or before it anyway's I decided to buy mac OSX snow leopard because my mac was still running on tiger so I went out to buy the disc etc and when I get home back up all my files an restart the computer and boot from the cd cause I was going to do a clean install I wipe out my hard drive and then when I go to install it I see a message saying I cant install it on this computer because I don't meet the ram requirements. and I was sort of stupid cause I didn't remember I was still running on 512 Mb of ram that came with my mac so now I have my computer wiped and I get a bit mad so I go to the apple store and they tell me its not really a big deal all I need to do is to buy at least 2 gigs of ram and I will have no problems installing it so he gives me a paper saying what ram I need to buy for my computer. so I go to fry's and buy a patriot 2 gig DDR2 SDRAM 667 MHz PC2-5300 unbuffered and all the stuff that makes the ram compatible with my mac so I go home open the ram access doors for the first time but before that the guy at the apple store showed me how to do it and there was an article on apples web site. after I put it in and re place the 512 Mb that came on the top slot I turn it on and and cross my fingers to hope it works and I get to the installation screen and let it install after 30 min or so I come back "installation complete" I was happy it worked and everything was fast huge upgrade from being stuck with tiger. so about 1 in a half month later I get on my mac and I hear 3 beeps and I start freaking out so I go on apple web site with my iPod and there I learned that the 3 beeps meant bad ram. so I go to the Apple store and they tell me patriot doesn't really work well on IMac's so I go to fry's and get a new 2 gig but this time a Kingston. I get home put it in (same slot) turn it on and it works! so about 2 months later I'm thinking I want to upgrade my computer to 4 gigs but then one day I turn on my comp and same thing! so I go to fry's get 4gigs (2: 2gigs) get home and this time I install for the very first time a ram in the bottom slot ( so now I got 2gig on top and 2 gig on bottom slow) turn on the computer. and..... beep.....beep......beep the same thing I have got these past months 3 beeps( and if your wondering it is the right ram and all) so at this point I don't know what to do so I take the ram out. and I do nothing a few weeks later I go to fry's to get some of my money back because it was like 50 dollars and get just a single 2 gig get home put it in and it beeps for a tiny sec then suddenly stops and I see the apple logo. after a few weeks it did the same thing but this time I took out my 2 gig and let it sit out side and like one day later I put in the ram it came with 512 and it worked but it was really slow. so one last time went to the apple store and the guy told me it was a bad logic board and that it would be pricey to fix it. so after that from that day till this day Wednesday, December 21 my mac just turns on when it wants to and doesn't turn on and gives me 3 beeps. around September of this year I had my mac turning on successfully with no beeps running on 512 Mb of ram until on Oct I turn it on and 3 beeps. my 2 gig of ram the month before that got chipped of by the clips on my iMac( and by the way all this time I have not been forcing it to go in etc and adding to much force to get it damaged. so now basically my mac could go for 3 weeks then one day you can turn it on and others were I'm stuck with 3 beeps. and even some times I turn it on it does 3 beeps for one round and suddenly out of no were stops and boots up. I really like this mac although I cant upgrade past snow leopard but its the only good computer I have right now cause when this computer acts up  i have to use my stupid slow windows vista laptop, and this is my last chance to see if anyone could help me cause I tried everything Excuse me from my grammar and spelling but I want to try and make this as quick and legible as I can.
                                                              Thank you very much for your time and Merry Christmas!

That iMac 4,1 Core Duo is an Early 2006 model that only supports 2x1GB modules for a total of 2GB.
See > iMac (Early 2006) - Technical Specifications

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