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As you can see from the image above the molex power from the PSU is connected to the card for additional power. from your post "Where as the power cable is duly connected" like the image?. If you connected the supplementary power, you have to consider the peripherals connected to your desktop and the brand of your power supply.
The link would help you if your power supply wattage is sufficient. Link
If you are using generic power supply, for example a 500 watt power supply the real wattage can be 300-400 watts only.
Using a tru rated supply might fix the problem. try to test a different power supply for your system or try to turn off or remove additional devices that consumes power that might help.
Depends on the video card ,it might require more power ,200w is fine for onboard but add other components and the system needs more power.
Disconnect the harddrive or CD ROM drive and see if the system will start.
If it starts then you will need more power 300-400w at least but shuttle power supplies can be expensive to get.
Try removing the video card & clean the copper contacts with a couple drops of house hold alcohol on a cotton swab. Use canned air to blow out the AGP slot. Blow out the video card's fan as well. Re-insert the video card & make sure it is firmly seated in the AGP slot. If you're still having the same trouble when you start up, try another AGP 8x card. You're 6800 may be going bad. My bet is the video card is dusty & not seated 100%. If you are thinking it might be the power supply, don't! When that goes, nothing will work. System restarts by its self can mean the CPU fan is dirty with lots of dust. You can blow this out as well. If it looks real dusty use a clean paint brush to help clean the fan. Don't be too rough with the brush. You don't want to break a fan blade.
If the issue continues post back here or click the Ask Me button.
Hi BIOS21, I know this much. I know you're motherboard can not use a PCI-Express video card. You're board can not support SLI. I know from looking & reading the manual for the MSI KM4-L you're board supports an AGP video card. I also know some AGP video cards need extra power for them to function. This varies from card to card. You did find an open power port on you're AGP NVIDA 6600 256MG 128bit card. So plug in the power cord. Every AGP card receives power from the AGP port. Enough to run the fan. Depending on the card it may also need more power provided by the system to function. This is you're case. The power connector would not be on the card if it was not needed. Other AGP cards use the same power cord as a floppy drive. (Just so you know).
Before removing your current card swap video outputs on the PC. If currently connected to the VGA output switch to the HDMI connector AT the video card. Use the HDMI to VGA adapter that came with the video card. Check & see if the display loads Pc starts. Taking the information directly from your motherboard manual pg. 25, your AGP video can only run at, AGP supporting 1.5 V 4X AGP cards. The 9600pro runs at 8x & it is not backwards compatible. (able to run at either 8x or 4x). You could run the Sappire ATI Radeon 256MB 9550 DDR AGP 4x/8x 1.5volt card.
Here is one site: http://www.colordrives.com/sapphire-ati-radeon-9550-256mb-ddr-agp-4x-8x-video-card---retail-box.html
When you do get the video card be sure to set your bios AGP to the correct size as listed in your manual pg. 109 subsection 4.4.7
I hope this helped.