The whole screen goes pink suddenly with vertical lines.

Our iMac is 3 years old and lately we've been getting this thing where the screen suddenly goes pink with lines down it and we have to turn the power off to get ris of it. Once it went white. I'm really hoping this is something we can deal with and fix before it becomes fatal. We absolutely cannot afford a new computer right now. Anyone had this happen? Know what it's about? Below are my computers specs.
Model Name:          iMac
  Model Identifier:          iMac8,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.66 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          6 MB
  Memory:          2 GB
  Bus Speed:          1.07 GHz
  Boot ROM Version:          IM81.00C1.B00
  SMC Version (system):          1.29f1

i already tried to move or tilt the screen and even press it but still the screen is pink... Yes perhaps I need to bring this again at the service center  Thanks!

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