My Computer Screen keep turning pink consequently put a bet on to usual. What's going on?

Answer:

its any your moniter your video card or the cables loose
Sounds similar to your monitor's CRT is going bad!

Is it an elder monitor?

I would need considerably more info to diagnose it throughly... ie on the bus graphics, AGP card, PCI card, LCD or CRT?

Can't be sure til I know these things!

If you have another computer you might try the monitor on a different system...if it seem to work OK on another system, then it is surrounded by your graphics display card, on board(built into mother board) or otherwise as listed above.