Moisture or Humid weather can affect my display / graphic card?

I did not use my macbook for 2 days (I left it in sleep mode). its been raining here for 2 days straight (Humid Summer in Seoul, Korea maybe more than 80 humidity). Yesterday night, the weather was too humid, a paper homework assign that I left on my desk for 3 hours was almost wet of absorbing humidity (like when you dry a paper who had a few drops or water before).
When I woke up my mac, the screen was distorted, with a mosaic-like square lines acroos the display. I restarted it several times and nothing. I couldnt access to my computer at all, because the distortion affected the computer since the booting stage.
Today I went to a friends house and tried to check the hardware with the diagnostics tool. After a few failed attempts, the computer spitted out my disk, restarted and the distortion problem was gone.
Since then, my mac is working as nothing happened. I still need to know why this happen and I just can blame the weather.
Please advice me.
my mac: macbookpro (late 2006) gen3, unibody (aluminium). Display, 15" Ati x1600 256mb.

Hi g,
The X1600 GPU in that model has had more than a few issues, and it's five years old now. It could be on the way out, perhaps aided in this situation by the humidity. Enough humidity can affect any circuitry.
Did you run Apple Hardware Test? That may be about the best you can do. "Repairing" a GPU means replacing the logic board.

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