Hello. Just built a new PC. Specs are:
ASUS M5A97PRO motherboard
Amd phenom x6 1075t
Asus Radeon HD6870 DirectCU
Kingston 2 gb of ram at 1333 MHz dual channel (4GB total)
Cooler Master 550GX 550W
Now, the problem:
Sometimes when I start the computer some random colored dots appear on my screen. Whenever I do something while they are on screen(open My Computer, or do a Refresh etc.) The dots change their location, and their count changes. They can be more or less. Overheating is out of the question, as I am writing here the temperature of the VGA is 31c. Under strain it has reached 65c TOPS. The CPU is also fine.
Perhaps the GPU is suffering from artifacts. Whilst unlikely at this age, it is always a possibility. Try it with another GPU, and if that doesn't help try it with another screen to see if it might be the screen.
Also check the cable, especially if it's a VGA cable it can suffer from interference. I had that once.