Ati radeon hd 4850

I'm using a Thermaltake TR2 430W PSU.

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,

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,

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.

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.

stormy13 said:

...

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.

or even higher, so it will be good for a couple more upgrades....

The 430w was an upgrade believe it or not. I had just bought it less then a month ago. I'll give it a shot though. I'm thinking 750W+. I would also like suggestions on here to work out the seating issue for the graphics card itself and its weight. The PSU suggestions are very helpful and will be the first thing I try as soon as I can. I think I need to replace the PCIe connector on the board. I think the lock tab is broken.

i like modular psu's, so you only have the leads that you need, not the whole rat's nest of cables like a traditional power supply...

Could you suggest one? Or is this one I have to "build" myself based on needs? Also, the physical PCIe lock tab has broken off leading to seating issues. Where/how can I replace this?

Budget?

Not an issue.

looking at newegg, it seems that most modern hi-power psu's are modular. they come with a bunch of leads, and you only plug in what you need.

i don't know how to replace a pcie slot though...if budget isn't an issue, maybe a new mobo?

also please send a new ninja-pc to mickey megabyte, devon, england please

I would prefer not to replace the computer though.

Thanks for the site to check. I'll go check it out. As far as the slot replacement, don't worry about it. Hopefully someone will still check out the posts, if not I'll start a new post for that specific issue.

Thanks again Mickey MB you've been VERY helpful!