Screen is all garbled on start up

and also i have graphic annomolies on the desktop it usually goes when i cover then with a window but its getting worse, on startup the apple loogo is all bitty and jummpy. any ideas?
I have recently moved but made sure it was looked after.
please help its getting worse, i have some screengrabs.
Andy
imac g5 Mac OS X (10.4.4)

Barbara,
You are WONDERFUL!!!! Yes my serial number falls within one of the cited groups so Apple should fix it (it is one month past the warranty).
As for your other question, a 10 inch imac is what an idiot has who doesn't proofread his posts before sending.
I meant a 20" iMac lol
i gotta start getting into the habit of re-reading before sending..........
Anyway many thanks again for your help. It is greatly appreciated.

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Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
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http://eshop.macsales.com/item/Newer%20Technology/CR2032/
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In daily use: R60F, R500F, T61, T410
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Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

Screen is all garbled on start up

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