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A pain but to find out for sure is to borrow your bro's card or any card and try that in your PC.
clear cmos and try again.
just put a jumper on them for 10 seconds or so then take it off.
any jumper will do, you dont need any power, infact you should unplug the power cable while doing it.
take power lead out hold power button for 10 secs then take battery out wait 10 mins to an hour also take card out and blow on pci express for dust
Also you could try take card out and power up with out GTX260 in see if you get error beep
is your bros psu a ocz 500w as well ?
Done that with every one of the 4 sticks mate. Various times.take ram out and reseat