|"i put a lil on the top of cpu and a lil on bottom of heatsink a thin layer on both and spread evenly"|
That could be the problem. AMD CPUs use the "middle dot" method. No spreading of the paste is required, in fact, doing so can cause problems as was mentioned by Fingers.
"it has a 450watt ps i put my 750 on it"
450W or 750W tells us nothing about the quality of the PSU. A decent brand name 450W is better than a cheap generic 750W, so without knowing the make/model or amperage specs of either unit, there's not much we can comment on.
"i have built many before with no issues"
Experienced builders always benchtest. If you didn't benchtest the hardware before installing it in the case, I suggest you follow Fingers other suggestion - pull everything out & start from scratch.