Sometimes my system refuses to boot, like after a shoddy OC or when the RAM is pulled out. It starts working again after a variable no of tries changing the position of the sticks (ie stick A in slot B and vice versa). Sometimes one change fixes it, sometimes it needs a dozen. Also, since this problem started, I occassionally get black dots on the screen. Like the white ones when ones GPU overheats, only black. During the days it doesnt work, if I try running one stick, this happens-
Stick A in slot A- perfect
Stick A in slot B- Boots, black dots on screen in games
Stick B in slot A- Boots, black dots on screen in games
Stick B in slot B- Refuses to boot
Is this some sort of RAM problem?
Coolermaster Xtreme Power 600W
Coolermaster Elite 335, 120mm 700 rpm at back, 80 mm 1200 rpm in front
XFX 4870 1GB
AMD Athlon II X4 620
2x2GB Transcend JetRam DDR3-1333
Asus M4A78 LT MLE
Windows 7 Ultimate x86
What slot does your motherboard manual say to put the RAM in if only one stick?
Is this a new build? Did anything about your setup change recently?
Download memtest86+ and burn it to a CD: http://www.memtest.org/
Run it by booting to the CD. Test your RAM, first with 1 stick in the appropriate slot. Let it run overnight if you can. Then switch sticks and run it again. If either one reports issues then you've got a faulty stick.