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Sorry to hear this, zynizen.
A few ideas off the top of my head:
1) Have you installed or touched any of the RAM recently?
2) Have you installed any software recently?
3) Have you tried booting your Mac with no peripherals attached?
4) Have you tried fsck in single user mode?
5) Were you using Time Machine (i.e. a last resort might be to go back to an earlier state)?
6) Does your brother live locally? If so, do you both use surge protectors and/or have there been any electrical storms or other power-related problems (this is a bit of a less likely scenario, but I thought I'd raise it)?
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