Grey screen boot problem keeps happening after fix

Recently my desktop mac (originally snow leopard upgraded to mavericks, if this information is important) failed to boot and was stuck on the boot screen with the apple logo and the spinning wheel.
I researched how to handle this (youtube being the most help) and managed to fix it by reinstalling mavericks. However, the problem happened again this morning and once again I had to reinstall. I have verified everything through disk utilities and nothing seems to be in need of repair.
Would anyone be able to tell me what the problem could be and if it is anything I could fix myself rather than sending it in to repair?

I have the exact same problem ;) and cant fix it nyself im reinstalling macs right now, if not il try to install snow leopard again, thats the only solution i have right now since all the attemps to fix failed because the problem keeps happening again

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