Hi I have been trying to upgade my card for a while now,
I have try'd a second hand geforce 6600 and all I got was no signal on my moniter,also the fan did not spin. (could be the card?)

Also try'd a brand new geforce 6200, no signal on moniter again?

My system is as follows.

Processor -  Intel(R) pentium(R) 4 cpu 3.20GHz 

Motherboard -
                      model -asustek p4p800
                     chipset- intel
              southbridge- intel
                     LPCIO- winbond

BIOS-
                brand- american megatrends
               version- 080009
                  date- 02/23/2004

graphic interface-

                  version- agp 3.0
           transfer rate- 8x  max 8x
              side band- enabled

memory-  ddr
               2 x 512 mb corsair
               1 x 1024 mb transcend

Hard drives-
                 1x 80gig internal 
                 1x 40gig internal
                 1x 250gig external

Graphics card(thats working)
                geforce fx 5900xt

350w power supply
running windows xp and 7
Please help me work this out as I just cant understand it.
Im looking at buying a 








Power Color HD3650 512MB DDR2 AGP Graphic Card next.
do you think it will work?
Why would the other 2 not work?

Thanks for any help.