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Boot back with original card, go into motherboard Setup and put all your AGP settings to conservative - ie: AGP 2x, AGP Fast Write off, etc. Now put in new card and see if it boots. If so, play with AGP settings one-by-one (ie: change one, reboot) to get maximum speed without crashing system. Also consider upgrading the motherboard's BIOS and double-check power connections. Double-check if the new card has a power connector on it. If so, it must be connected.

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Q: Tried installing a new Gforce 256mb DDR 4x - 8x AGP video card on a PC with PC400 Motherboard and 512mb SDRAM 4X AGP now the machine doesn't boot why?
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