Bad video=Bad logic board in new iMac?

Just had 2 less than fruitful phone call with Apple; my one month old imac has suddenly developed horrible video problems. (pixelated screen, messed up images, missing info/icons from desktop)
Apparently the logic board is bad and needs to be replaced. Our local mac shop is with the university and is closed until January 17, so we are without the computer until then?
We can't send it in, and the other nearest store is 150 miles away.
Tech people said they've been hearing this... but I thought the problem was resolved before this new line came out? Plus no support for a month?
Sorry quite frustrated by the non-options right now. Is anyone else in the same boat or familiar with this situation? Thanks.
iMac G5 isight   Mac OS X (10.4.3)  

I received my isight mid-November and within a couple of hours, my screen started having problems. Required new logic board. Logic board installed by my local Apple store. Haven't had a problem since -- perfectly quiet too!
iMac (isight)   Mac OS X (10.4.3)   2.1 Ghz, 1.5 Mg, 250 HDD

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