I have a Macbook Pro. Specs are below

Model Name:          MacBook Pro
  Model Identifier:          MacBookPro3,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.2 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          2 GB
  Bus Speed:          800 MHz
  Boot ROM Version:          MBP31.0070.B07
  SMC Version (system):          1.16f11
  Serial Number (system):          W880360MX91
  Hardware UUID:          00000000-0000-1000-8000-001EC20DE2D3
  Sudden Motion Sensor:
  State:          Enabled
Recently while using iMovie for about 20-30 min. My screen will go blue then basically restart(shut down all apps running). The computer works fine if I'm not using iMovie. What should I do to resolve this problem?

Firstly, have you applied the EFI Firmware Update 1.5.1?  Secondly, there is a known problem with the video in your model.  See MacBook Pro: Distorted video or no video issues.

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