Power Supply Unit compatible with Motherboard?

The specs say that your mobs uses a standard ATX power supply. Shockingly it was the first hit using google.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01...

The motherboard specs don't prove anything about the physical size of the psu - even mini-itx motherboards use atx power connectors.

Correction: standard ATX power supply connection. I made no claim about the size of the power supply just the type of connector.
That is the biggest thing to look for when upgrading prebuilt machines. They are getting better but still tend to use proprietary parts, even proprietary parts that look like standard parts. That was the case with power supplies for a long time, they looked standard but would have wires switched so if you plugged a standard ATX PSU in, boom, dead mobo and possibly PSU.

So I should upgrade my motherboard first?

If it uses a proprietary power supply with wires switched, connecting a standard motherboard to it could be just as bad as connecting a standard psu to your current motherboard. However, the specs list ATX power connectors, so I don't think you have to worry about proprietary psu wiring.

Could you provide the full model number of your prebuilt computer and/or a picture? I'm concerned about whether your case would be able to take a standard atx-sized psu.

Current PSU- http://img17.imageshack.us/img17/1407/dsc03657z.jpg

PSU Cords - http://img171.imageshack.us/img171/18/dsc03659c.jpg
http://img96.imageshack.us/img96/7131/dsc03658a.jpg

I dont know but I think its PCI Slot- http://img689.imageshack.us/img689/2141/dsc03662fg.jpg

Model No- CQ3236IX

Case- http://img16.imageshack.us/img16/1563/dsc03663w.jpg

Thnx  

Based on the wire colors, I'd say that's a standard ATX power connector. According to HP, that Compaq model is sold in India. See if you can find a psu that's in Tier 1 or 2 here:
http://www.eggxpert.com/forums/thread/323050.aspx
According to the eXtreme Power Supply Calculator Pro, the recommended psu wattage for your system with a standard hd 6670 is 216W with 13.8 amps on the +12V rail.

Actually when I was in India for few months, I bought that PC thats why. So I can buy Tier 1 or 2 PSU?  

Yeah, although if you're in the US now, I don't know where you were planning to buy a Cooler Master Thunder 450W psu. It doesn't show up in a google shopping search.

Thnx alot for this all info. Very very grateful to you.  

Thnx alot for this all info. Very very grateful to you.  

Best answer selected by Jeremy9093.