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admin answers:

If it’s shutting down cleanly, it’s not the power supply. A bad power supply would just shut the power off and crash the computer.
Read an article on creating a shut down event, and learn to remove one.
Bestec power supplies aren’t the best, but they are pretty good for OEM.
And it’s more than capable of supporting the hardware you have there. When they die it’s because someone sticks a powerhog® video card in one and expects an OEM power supply to kick out 500 watts.

admin answers:

That blinking Green light should be solid.. Not blinking.

You need another power supply… Or a motherboard. Either buy a power supply tester, or take it to a repair shop and let a professional diagnose and repair it.

But those Bestec power supply units are garbage.. So it is probably your PSU.

admin answers:

Oh, please don’t go through HP. They’ll just sell you another marginal Bestec 300 watt for a price that could get you a 600 watt PC Power and Cooling! There’s a scant amount of Online data on this system’s SMPS unit, so you need to pop your case and look for the phrase „ATX“ on the side of your power supply. It should have it (be ATX,) as your HP looks to be a standard mid tower.

I suggest this power supply as a cheap and reliable upgrade. I put the 380 watt variant into my HP; it fits wierd because only two screws line up, but otherwise fine in my 1630n midtower. The supply is made by SeaSonic, and is at least 80% efficient. Here’s a link:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371006

I would like to also tell you that the supplies other people are linking you to are mostly dangerously substandard products that exemplify the worst of Taiwanese SMPS design. Expect them to be missing most of their power filtering bits, weigh very little, have 20 guage leads to the motherboard, thin housing metal, cheap caps that have short lives, an ancient ATX 1.3 design with heavy 3.3V and 5V rails, and worst of all, an inability to put out more than 2/3 of their claimed power without catastrophically failing. If you want something like those, Newegg has them for twenty bucks without rebate, but again, they’re worst than HP stock by a longshot. Google „deer power supply“ if you doubt how bad they could be.

admin answers:

That 400 watt power supply is Gateway part number 6506042R, which is apparently a Bestec ATX-400GW S1R. Bestec is normally kind of a crummy brand, but that one has two +12V rails, and claims to support up to 30A combined on the +12V.

Thus, the specs don’t sound too bad. Because it’s Bestec, it might not be super reliable over the long term, but I don’t think you need to immediately replace it. (In fact, that power supply probably would have supported a somewhat more powerful video card upgrade too, like a GeForce GTS 250 or Radeon 4770.)

http://www.power-on.com/atx400gw.html

Beyond that, if you want to know with 100% certainty what power supply you have, just open the side panel on your computer, and read the label right on the power supply.

admin answers:

All of the 8800 are going to require a PCIe power connection straight from you power supply (which i am assuming you do not have) most of the 8600 are relatively cheap and will not require the PCIe power connection. But it is always good to check to make sure, ( i find the easiest way is just to look at the pictures of the card an see if there is one in the back) i am not as knowledgeable about ATI cards but i would think that the 3870 would have the same problem, but the 3850 would be OK but dont take my word for it.