sometimes don't startup! 08'MBP

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hey everybody,
i'm new @ forum, , problem might old question of you, not find similar machine actions.

so... might sound strange mbp don't start up sometimes, , mean sometimes, because after trying second or third time (sometimes 5or6) starts , when runes perfectly, , asked for!

when not go, grey screen, ear clicking sound , sleep light blinks tree times , after +- 5 seconds repeats 3 blinks , if leave it stays ever!
made hardware test, tried different software check ram , other parts of hardware, , nothing found problem, sound know there no problem great start when need , want to!!
it's bit frustrating , makes me not confident on computer anymore...

don't know if can me or have advice, if so... please do!
in advance!
 

open disk utility. click on hd. run disk repair/verify ever. see if comes anything. sounds either hdd or logic board shenanigans.
 


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