Half of the time my iMac Wont boot?

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im new here im sorry if in wrong section( first post!) have been having issue ever since upgraded lion. problem 50% of time mac wont start. happens start computer , hear chime , gear pops , doesn't stop spinning. selecting boot drive holding alt seems increase odds getting annoying , quite scary now. few weeks ago seemingly found solution selecting boot drive in system setting problem has reoccured. strangely, when computer on works fine can bit sluggish @ times, assume because use quite memory intense programs , have 2 gb of ram ( bought 8 other day , should arrive day now) appreciated :d

specs: imac 2009
2.66ghz processor
2 gb 1067 mhz ddr3
nvidia geforce 9400 256 mb

again
 



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