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#21
CPU works, problem was in MSI mother, mother has 4 DDR slot, 2 is blue and another 2 black, I have CPU i5 750 and i3 550, when I set memory in blue slots PC doesn't boot up with i5 750 but boots up normally with i3 550! replacing Memory in black slots PC boots up with i5 750 normally, , Sorry for my bad english
Wow... you got it to work... amazing, and very good sleuthing. Way to stick to it, I was sure you had a dead cpu.