IMac picture pixilated and freezes up on start up.

When I start my iMac it seems to start ok at first, then the screen gets pixilated and freezes up.  Some times I can get further in the start up process than others. I did just update to OS 10.10.3.
Mac (21.5-inch, Late 2009)
3.3GHz Intel Core 2 Duo
8GH Memory
  Processor Name: I
  Number of Processors: 1
  Total Number of Cores: 2
  L2 Cache: 6 MB
  Memory: 8 GB
  Bus Speed: 1.33 GHz

I had to make an OS 10.10.3 Start Up Disk and reboot using that. I checked the disk for any damage then restored from Time Machine Back up. Seems to be working better.

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