Mac Pro :: HD4870 Causing Computer To Keep Chiming?

Jul 4, 2010

I was trying to flash my video card but when i tried re-booting all my MacPro does is that it keeps chiming every few seconds and won't bootup.

Video card :
ATI RADEON HD 4870 512M GDDR5 PCI-E DUAL DVI-I/TVO
PN 288-2E131-000SA
SKU# 11133-20-42R
MAC PRO :
MAC OSX 10.6.4
2 X 2 GHZ DUAL-CORE INTEL XEON
4 GIG RAM

Option - command - P - R Boot it with my uncle's PC running on Win 7, My card doesn't even showed up with I use GPUZ or Atiflash. create a partition using FAT and used Freedos to bootup, tried Atiflash, it still doesn't show up when i use the -i option bootup using bootcamp Win7 on my MAC, it showed unknown device yesterday, I finally managed to get GPUZ to show HD4870 but, its not detectable by winflash and when I rebooted it, the same chiming starts again.

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