The towel trick is damaging to the pulse width modulation circuit. You're better off doing the VGA resolution reset and having it warranty serviced when you can, or if your warranty is dead, popping it open and installing a heatsink on the memory grid. You should use pennies from 1982 or earlier due to the higher copper content. Most "DIY" guides for the penny heatsinks are in error, you don't want to stack them directly. You don't want to use hot glue, or electrical tape either. You want to mix heatsink compound and epoxy together, and space the top two pennies off center for maximum surface space exposure. Low profile BGA heatsinks are a better idea than pennies. Find some geek at school to do the repair for a six pack beer or something.
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