Photoshop problems: Coloring impairment

[Killasandra]

My photoshop has been acting up lately. It doesn't let me color in any single color. When I try to color with the paintbrush, every little mark it makes is in a different color. Like if i use say blue , and I go to paint I'll make a line and the colors green, purple, and red will make up a line, the colors are just circles all lined up. Do you understand what I'm trying to explain? If so could you tell me how to fix it?

[GriNGo]

Turn of the color dynamics of your chosen brush. Press F5 to open the brush palette, and there, on the leftmost column there should be a list with that option selected. Just tick it off.