Booting from external device causes kernal panic

I am suddenly unable to boot my first generation MacPro 1,1 from any external device. I have tried my Leopard install DVD, a USB thumb drive, and an external hard drive. All of these result in a Kernal Panic. I was able to boot into the hardware test from my original cd that came with the computer. The hardware test reported no problems.
Here is the kernal panic I get every time:
Wed Jul 9 16:42:50 2008
panic(cpu 2 caller 0x001A49CB): Unresolved kernel trap (CPU 2, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x00000098, CR3: 0x00b74000, CR4: 0x000006e0
EAX: 0x00000000, EBX: 0x00000000, ECX: 0x09357804, EDX: 0x0935aa24
CR2: 0x00000098, EBP: 0x4a27b8f8, ESI: 0xffffffff, EDI: 0x4a27b954
EFL: 0x00210202, EIP: 0x68791ff2, CS: 0x00000008, DS: 0x014f0010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x4a27b6a8 : 0x128d0d (0x3cc65c 0x4a27b6cc 0x131f95 0x0)
0x4a27b6e8 : 0x1a49cb (0x3d2a94 0x2 0xe 0x3d22b8)
0x4a27b7f8 : 0x19b3a4 (0x4a27b810 0x935a804 0x4a27b828 0x68791bbf)
0x4a27b8f8 : 0x6877efbf (0x9357804 0x68931700 0x0 0x4a27b98c)
0x4a27b938 : 0x6874e794 (0x0 0x4a27b954 0x0 0x1)
0x4a27b998 : 0x68750982 (0x68931700 0x0 0x68943000 0x61c9e000)
0x4a27bb38 : 0x68748bbb (0x0 0x4b09d0 0xf3000001 0x79943000)
0x4a27bb88 : 0x68749d6e (0x8a6e400 0x8b7b100 0x0 0x0)
0x4a27bbd8 : 0x68749e80 (0x8a6e400 0x89ed580 0x8a6e400 0x1)
0x4a27bc18 : 0x5a2da875 (0x8a6e400 0x1 0x0 0x0)
0x4a27bc78 : 0x5a2d406b (0x8a6e400 0x5 0x5 0x8a6e400)
0x4a27bc98 : 0x38c991 (0x8a6e400 0x8934370 0x8934370 0x0)
0x4a27bce8 : 0x3b2df6 (0x8a6e400 0x8934370 0x8934370 0x0)
0x4a27bd48 : 0x18d6fd (0x8a6e400 0x8934370 0x0 0x0)
0x4a27bdb8 : 0x12b4ee (0x92ebe80 0x92ea998 0x4a27bdf8 0x11e042)
0x4a27bdf8 : 0x124b17 (0x92ebe00 0x89005a8 0x9314618 0x0) Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.NVDAResman(4.5.6)@0x68747000
dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5a3ca000
dependency: com.apple.iokit.IOGraphicsFamily(1.4.8)@0x5a2cc000
dependency: com.apple.iokit.IONDRVSupport(1.4.8)@0x5a2e7000
com.apple.iokit.IOGraphicsFamily(1.4.8)@0x5a2cc000
dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5a3ca000
Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386
Any help would be appreciated

I removed my Nvidia 8800gt video card and replaced it with the Nvidia 7300 that came with the computer. I can now boot from external drives. I guess there is some conflict with the 8800gt.

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