Took old pc with athlon 64X2 dual, 1.90 ghz, 2gb ram and 80gb hd and formatted with ubuntu 10 then upgarded to 12.04. It brings up ubuntu fine but randomly the scrren goes black and then back to normal. I tried changing system settings under "brightness and lock" to 1 hour but it didn't help. Are there some updates that need to be installed. Update Manager says not. Thank you for your consideration.
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