IMac 24" 2.93GHz turns off

My AppleCare just ran out a little while ago and now my iMac is starting to shut off. Usually, in iMovie and iPhoto but today if I plug a USB Memory stick in I lose connection to my Bluetooth devices. Yesterday, everytime I tried to open a .pdf file on the USB drive the computer would shut off. I am fairly certain it is the logic board but was hoping that someone may have had a similar issue? I wish this had happen a couple months ago then it would have still been covered. Any advice would be greatly appreciated.
Thanks,
Derek

I ran the memory test and here are the results.
Test sequence 1 of 255:
Running tests on full 5986MB region...
  Stuck Address       :                                 setting  1 of 16                                                ok
  Linear PRN          :       setting  1 of 16ok
Running comparison tests using 2993MB buffers...
  Random Value        :         ok
  Compare XOR         :             ok
  Compare SUB         :             ok
  Compare MUL         :             ok
  Compare DIV         :             ok
  Compare OR          :             ok
  Compare AND         :             ok
  Sequential Increment:             ok
  Solid Bits          :                   Block Sequential    :                                     setting   1 of 256ok
  Checkerboard        :                 ok
  Bit Spread          :                                     setting   1 of 128                                                      ok
  Bit Flip            :                                     setting   1 of 512ok
  Walking Ones        :                                     setting   1 of 128                                                      ok
  Walking Zeroes      :                                     setting   1 of 128                                                      ok
These are Temperature Monitor readings
2012-06-02 16:49:39 +0000
Ambient Air:                                         82℉
CPU A Heatsink:                                      108℉
CPU A Proximity:                                     118℉
CPU A Temperature Diode:                             108℉
Display Screen Proximity:                            118℉
Graphics Processor Heatsink 1:                       140℉
Graphics Processor Temperature Diode:                145℉
Hard Drive Bay 1:                                    129℉
Main Logic Board:                                    118℉
Northbridge Chip:                                    156℉
Northbridge Heat Sink:                               149℉
Northbridge Position 1:                              129℉
Optical Drive:                                       113℉
Power Supply Position 1:                             153℉
SMART Disk WDC WD6400AAKS-40H2B0 (WD-WCASY4396914):  135℉
CPU Core 1:                                          106℉
CPU Core 2:                                          106℉

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