I HAVE A I MAC WITH MOUNTAIN LION BUT WHEN I DOWNLOAD MAVERICKS ALL STAR GOING BAD AND RIOGTH NOW THE COMPUTER DOESNT START I AM **** UP HOW CAN RESTORE MY ORIGINAL OS LION MOUNTINE

I HAVE A I MAC WITH MOUNTAIN LION BUT WHEN I DOWNLOAD MAVERICKS ALL STAR GOING BAD AND RIGTH NOW THE COMPUTER DOESNT START I AM **** UP HOW CAN RESTORE MY ORIGINAL OS LION MOUNTINE.
OR WHAT CAN I DO TO RESTORE MY COMPUTER THERE IS A LOT INFORMATION THERE WHY MAVERICKS IS TROUBLESHOOTING.

Don't post in all caps.  Besides being more difficult to read it's tantamount to shouting and is considered rude in forums.  What problems are you having? What model Mac do you have, how much RAM and free space on the boot drive?
Boot into the Recovery volume (boot with the Command + R keys held down) and try the following in order as needed:
1 - select Disk Utility and repair both the disk and disk permissions.  Reboot normally.
2 - reinstall the Mavericks system.
OT

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