iMac never boots on the first try


i have mid-2007 imac running 10.6.8. few weeks ago replaced hard drive. seemed fine first week or started notice taking longer start up. now, last 5 startups in row grey screen (the apple logo never appears) , nothing else. i've waited upwards of 5 minutes happen never does. wind doing hard shut down. when restart again, fine. strange. far i've done run disk utility no issues found. ideas?
 

i got 2007 repaired exact behavior twice. 1 of times hard drive, second time logic board. run apple diagnostics or check if system ok.
 


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