|"The power supply was lame"|
How so? What was the make/model/wattage & amperage specs?
"this has now been beefed to 750W"
And how do we know that it's an improvement if we don't know the make/model/wattage & amperage specs of either PSU? A decent 750W PSU should have cost you at least $75 before rebates. Did you pay that much?
"chip was re-pasted up could this still be heat issues"
Why was the chip "re-pasted up"? Since you have an AMD CPU, you should have used the "middle dot" method. If it was done any differently, the CPU will run hot & possibly overheat, causing the system to shutdown.
Remove the heatsink from the CPU. Clean off ALL the paste from the top of the CPU & bottom of the heatsink, then place a tiny dab in the center of the CPU. Do NOT spread it around. Just set the heatsink on it & lock it in place.