Smps problem circle 600 watts

The AMD Phenom II X4 850 (HDX850WFK42GM) uses up to 95 Watts of power,

http://www.cpu-world.com/CPUs/K10/AMD-Phenom%20II%20X4%20850.html

(Electrical/Thermal parameters)

While the AMD Phenom II X4 965 uses up to 125 Watts, or 140 Watts; depending on which Part Number....

HDZ965FBK4DGI uses up to 140 Watts.
HDZ965FBK4DGM uses up to 125 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Phenom_microprocessors#.22Deneb.22_.28C2.2FC3.2C_45_nm.2C_Quad-core.29

Scroll down a little.

I'm going with Not enough power from the Power Supply.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01969880&tmp_task=prodinfoCategory&cc=us&dlc=en&lc=en&product=4120661

Power Supply is ONLY 300 Watts?

Yes, the Power Supply is too small IMHO.

Is there also a graphics card you have installed, and not stated?

Regards,
joecoolvette

I think this website describes the fix for your problem, please check here

So you changed everything except 1 thing, power supply. Try another power supply or power suply cord.
If it doesn't work, try another graphic card, maybe there is some shor circuit.

Looks like an electrical contact problem. Try pulling out and re-inserting all the removable elements, especially the memory modules. When you instert them, make sure to push them firmly into their sockets until the side latches click in place, and wiggle every module gently to make sure it's properly seated in the socket.
If removing and installing back memory and expansion cards doesn't help, it may be a broken track on the board, a problem with some socket itself (processor, memory, cards...) or some other parts on the board, like capacitors, power transistors or such.

Your MB is AM3 with 128MB DDR3-1333 built-in, four 1.8 Volt DDR2-1200+ depending on cpu. Have you enabled cpu 64 bit extensions? Tried slowing down your memory bus?
My ASUS use dual channel for dual core cpu. I have 2 yellow and 2 black dimm sockets. Both dimms in yellow is single channel, one in yellow and one in black is dual channel. Might try 2,1,2,1 rather than 2,2,1,1 order. If only your 2 1GB dimms are seen then why do you get 4 GB from 1GB+1GB? Sounds like sockets 1,2 are giving you 4GB and 3,4 don't work? Are the 1GB+1GB in 3,4 visible if the dimms in 1,2 are removed? Per Gigabyte page your AMD Phenom II 920 is AM2+ : "Note: Due to AMD AM2+ CPU limitation, memory module DDR2 1066 or above speed is only supported by 1 dimm per channel." Per AMD (which does not show your cpu, AM3 cpu fit AM3 or AM2+ socket and support ddr2 and ddr3, AM2+ cpu only work in AM2+ socket and support ddr2 only.

This board should have everything you want and be ready for a 45nm architecture when you decide to upgrade your processor.
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4399367&CatId=2874

It seems like there could be a short in the system. Check to make sure that the board is tight in the case, and that no foreign objects are causing the motherboard to short. If there is no obvious problem and the motherboard is new, I would return it as a defect.

But you do get the bios posting?
Check the HDD is connected correctly and has power.

I had the same issue with my AMD Athlon 3800+ dual core. I found that I wasn't getting enough airflow to keep the system and processor cool. You may want to check the heatsink and fan rating for your processor unless it was sold in a bundle. Also, On AMD's of such power, they tend to run hot if overclocked. Look into, if you haven't already 2 case fans to go along with the processor fans. I recommend a 90mm in front and a 80mm in the rear of the case. If this doesn't help, let me know.

Hi, i am struggling to understand your question 100%
but if its, is the 500watt power supply enough or good enough for the spec you have listed then yes it would work fine with the spec.

Happy New Year

John