I had run that the other night, but didn't know how to read the blue page.
Or do I let it sit? It pretty much stayed on a blinking underscore for about 5 minutes, should I have let it keep going?
memtest86 will give you a couple options about using 1 cpu or 2 (use 1), and then test your ram. Let it sit there till it doesn't look like it's doing anything (it should run a bunch of tests, showing progress in the top right). It will either stop and say ERROR somehwhere on the screen, or say everything completed to 100% (with no error indication)