Mac won't start, displaying just small checkered elements and Apple Logo
This is what my little friend looks like 😟
iMac, OS X Mountain Lion (10.8.3)
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Restart and hold the command and r keys (both keys together) down till you see the Apple logo. Select Disk Utility and hit Return.
In DU, select your hard drive, and run Repair Disk. When that is done, quit DU and restart.
Good luck.