System will not fully boot to display desktop

I HAVE A IMAC MID 2007 INTEL CHIP 2GIG RAM 250 HD, PROBLEM STARTED A FEW DAYS AGO WHEN I WAS UNABLE TO LOGIN INTO MY USER ACCOUNT, OTHER USERS WERE ABLE, CHATING WITH APPLE  I DID EVERYTHING POSSIBLE, CHANGED PASSWORD, RESET, NVRAM,, SAFE MODE, NOTHING WORKED, PERMISSIONS, SO I RE-INSTALLED THE OS 10.10, TWICE . AFTER THE INSTALL THE SYSTEM WORK GREAT FAST AND NO ISSUES, UNTIL TO LOG OFF AND SHUT DOWN,
UPON  RESTART THE SYSTEM GOES INTO THE NORMAL START UP THE APPLE ICON WITH GRAY SCREEN APPEARS THE BAR RUNS ACROSS THE SCREEN AND THEN THE SCREEN GOES TO A DARK BLUE WITH THE GRAY WHEEL SPINNING, AND SPINNING IT WILL NOT LOAD. I AM ALSO UNABLE TO START IN SAFE MODE.
I HAVE DONE ALL THAT I CAN THINK OFF, HAVE I MISSED SOMETHING? IS THE START UP COMMAND LINE BAD??
BEFORE GOING TO APPLE ANY LAST IDEA'S  ?????

Please do not type in all capital letters, that is like shouting and we can hear you just fine. Run Apple's Hardware Test in extended mode 2-3 times,   you will need the original install discs that came with the computer 8 years ago to run AHD. The reason to run AHT multiple time is it does not always find errors after the 1st or 2nd pass, however when it does they are correct. Also 2GB of RAM is the minimum specifications to run Yosemite, you should upgrade the RAM to 6GB, the maximum a 2007 can accommodate, if you decide to upgrade the RAM purchase only Crucial or OWC (www.macsales.com), in both case ONLY purchase direct from the vendor.

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