Won't allow me to sign in to the desktop

When I turn on my computer the log-in menu appears and i type my password and then it seems as though it is loading the desktop, however, after a couple minutes the login screen just pops up again. I ran the hardware checker and it told me I have the error 4M0T/4/40000003:HDD-1445 ... Any help would be greatly appreciated
Mike

There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
1. Boot into Recovery (command-R at startup; 10.7 or later), from a local Time Machine backup volume (option key at startup; 10.7.2 or later), or from your installation disc (C key at startup; 10.6.8 or earlier.) Launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
2. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
How to use and troubleshoot FireWire target disk mode
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

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