video card and monitor problem

I got a new video card for x-mas. I installed the new video card and connected the monitor to computer (which is only about three months old). The monitor does not detect the new video card, and shows no signal, yet it works fine with the integrated video card.

The video card is: NVIDIA GeForce 8600 GT 512 MB, and it is the overclocked version. Computer stats are: AMD Athlon 64 5000+ Processor, 2 Gb of memory, MCP61PM2MA AM2 uATX Motherboard, and 300 W of power supply.
or here is a link http://support.gateway.com/s/PC/R/1009603/1009603cl5.shtml

If I do not have enough power can the new video card get damaged? How can I resolve my problem with the new video card? Please give me any recommendations.

 

IMO PSU too small, could very well be your problem
You might need to enable your PCI-e in BIOS

Are you sure you installed the VC correctly?

 

Or, you may need to disable integrated video in the BIOS.

 

i forgot to mention that i cannot run both the new video card and integrated card at same time. if the new video card is plugged in then plugging the monitor to integrated video still results in no signal on monitor. and plugging the monitor to new card still no image.

so is power supply the problem or could it be something else i need to do?

 

also, i do not want to damage the new video card. if i do not have enough power can i damage the video card?

 

I also think the power supply is too small.

This is from the eVGA web site for their 8600GT. IMO, these recommenations are low. I'd go with a minimum 450w with at least 20a on the +12v for a single card. You can't damage the card by a lack of power, but don't keep trying with that old 300w. You may damage the PSU, and if that gets damaged first, then you might get bad voltages flowing thru the rest of the PC. So, Get yourself a decent PSU; a good one is about $50 +/- at Egghead. Swapping it out is a piece-o-cake.....