New
#11
That there is probably the cause of the problem more than anything. It is an OK power supply as a replacement for low power that come in pre-built computers, but nit really up to running a video card like the 4850. Specs on it can be found here,I'm using a Thermaltake TR2 430W PSU.
Newegg.com - Thermaltake TR2 W0070RUC 430W ATX12V V2.2 Intel Core i7 Compliant Dual 80mm Fans Full Cable Sleevings Power Supply
and a not so glowing review here,
Thermaltake Purepower 430W NP Power Supply Review | Hardware Secrets
from the conclusion,
All things considering might want to give serious consideration to getting a good quality power supply of at least 500W if you want to run that card.This is an old ATX power supply where the manufacturer added a 24-pin motherboard connector, SATA power cables and a PCI Express auxiliary power cable to make it compatible with computers available today. Simply updating the cables doesn’t make this power supply an updated product. This is so true that this power supply is listed as ATX12V 1.03 by Thermaltake, and not as ATX12V 2.x, despite the presence of the 24-pin motherboard connector and the 6-pin PCI Express auxiliary power cable for video cards.
The main problem with this power supply is that it can’t deliver its labeled power. It is, in fact, a 350 W power supply.