Your problem seems more associated with your memory than your monitor.
Let memtest run a full and complete test on your memory. Before running this test make sure you try reseating your memory in your motherboard.
Go to Memtest.org
and download the precompiled iso
in zip format.
Burn the iso image ( once unzipped ) to a CD. Reboot your computer with this CD in the drive and boot from the CD. You will see a screen similar to:
Let us know the results of the tests.
Edited by techextreme, 23 March 2010 - 01:15 PM.