emosun

Theres your problem. You really need a better powersupply. 280w is not very much and if it's the one the case came with it's probably very low quality and doesn't have enough amperage. We usually recommend throwing away the powersupplies that come free in the cases because of this.

For that 4670 you really need a 450 to 500w or higher with 26amps on the 12v rail and 80+ cert. Quality brands include antec's trio , thermaltakes toughpower , corsair , silverstone , pc power and cooling , or coolermaster.