Check your PC inside for rust

[Frozen_Texas]

Maybe it's time to open your PC's to check if there is rust on some elements (chokes) of the motherboard, if you have one from Asus - see these photos as examples

more to read @
http://www.semiaccurate.com/2010/01/15/mystery-rusty-chokes/ &
http://forums.techpowerup.com/showthread.php?t=113002

 

[Frozen_Texas]

I think thats more down to neglience and running it in a moist/damp atmosphere

I used to have issues with corrosion on the ram at my old house and I'd have to clean the contacts to stop BSODs on boot

semiaccurate says it's due to too high humidity during production process of these chokes, as the moist is inside the chokes