Sadly, you'll have to note the size of the Power Supply Unit (PSU) as well since your newer video card may be drawing 20 or more watts. Either the motherboard or PSU may have an issue with this. Unless you have about the 400+ Watt PSU, the power can be the cause and you'll have to swap the motherboard out to see if it's still ok.
This is my second try with a GeForve Fx video card in my AGP slot. I used to have a Geforce 4 video card but the fan went out on it and the processor burnt up, so I got a new one. I placed the new card in the AGP slot and i get no start up by my computer. It cuts on but the screen remains blank and I get no beeps. I took that video card back and got a new one. I just tried the new one and the same thing happens. I know the video card works cause i tried it in my roommates computer. I also tried his "out of date" video card in my AGP slot and it works fine. I tried updating my bios and chipset but i am not positive i did it right (my motherboard is also fairly new). My old video card works fine in the AGP slot but since the processor is bad, once windows starts i get huge white streaks on the monitor and then it just turns into a bunch of color squares. So i figured the AGP slot is fine. Does anyone have any ideas?
Motherboard: PC Chips 920ML series
Chip set: VIA VT8753(P4X266) NorthBridge and VT8233 Southbridge
Thanks so much!