Monitor blacks out when booting with KVM Switch in the middle

Hi
I have attached my Xserve with an iMac G5 to a KVM Switch. When I boot up the Xserve the monitor blacks out after the apple logo.
I know that the Xserve tries to autodetect the monitor. Apparently it fails in its job when the KVM is in the middle. Everything works well when I remove the KVM and connect the monitor directly to Xserve.
Any ideas how do I disable the monitor autodetect feature - or something?
Xserve (intel) Mac OS X (10.4.1) dkvm-4u KVM switch

Hi all
I did try that. No luck.. Strangely enough, I realized that when the server boots up, the login screen defaults to 85HZ refresh rate. I found a site that explains the plist file that you can change to force it to 60HZ. What is weird it if I boot the Mac connected to another LCD, then move the cable to the KVM, it works. It almost seems like when the mac is booting, it sends some sort of signal just before the login screen comes up, that screws up this KVM. Tried updating firmware, still in the process of speaking with the KVM support people...
very strange..
Enio

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    Apr 18 13:03:38 localhost kernel[0]: hi mem tramps at 0xffe00000
    Apr 18 13:03:38 localhost kernel[0]: PAE enabled
    Apr 18 13:03:38 localhost kernel[0]: 64 bit mode enabled
    Apr 18 13:03:38 localhost kernel[0]: standard timeslicing quantum is 10000 us
    Apr 18 13:03:38 localhost kernel[0]: vmpagebootstrap: 512109 free pages
    Apr 18 13:03:38 localhost kernel[0]: migtable_maxdispl = 71
    Apr 18 13:03:38 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
    Apr 18 13:03:38 localhost kernel[0]: 77 prelinked modules
    Apr 18 13:03:38 localhost kernel[0]: ACPI CA 20060421
    Apr 18 13:03:38 localhost kernel[0]: AppleIntelCPUPowerManagement: ready
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=2 LocalApicId=7 Enabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=3 LocalApicId=6 Enabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=4 LocalApicId=0 Disabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=5 LocalApicId=0 Disabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=6 LocalApicId=0 Disabled
    Apr 18 13:03:38 localhost kernel[0]: AppleACPICPU: ProcessorApicId=7 LocalApicId=0 Disabled
    Apr 18 13:03:38 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
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    Apr 18 13:03:38 localhost kernel[0]: using 10485 buffer headers and 4096 cluster IO buffer headers
    Apr 18 13:03:38 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
    Apr 18 13:03:38 localhost kernel[0]: Started CPU 01
    Apr 18 13:03:38 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
    Apr 18 13:03:38 localhost kernel[0]: Started CPU 02
    Apr 18 13:03:38 localhost kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
    Apr 18 13:03:38 localhost kernel[0]: IOAPIC: Version 0x20 Vectors 64:87
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    Apr 18 13:03:38 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5] (S3)
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    Apr 18 13:03:38 localhost kernel[0]: BSM auditing present
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    Apr 18 13:03:38 localhost kernel[0]: Matching service count = 2
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    Apr 18 13:03:38 localhost DirectoryService[42]: Launched version 2.1 (v353.6)
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    Apr 18 13:03:52 Alexs-Computer ntpdate[94]: can't find host time.euro.apple.com\n
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    Apr 18 13:08:25 localhost kernel[0]: hi mem tramps at 0xffe00000
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    Apr 18 13:08:25 localhost kernel[0]: 64 bit mode enabled
    here couple more logs right at the moment of crash (found in paic.log). hopefully then can shed som elight on the troubles:
    pls advise
    Wed Apr 18 13:04:16 2007
    panic(cpu 0 caller 0x001A429B): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
    CR0: 0x8001003b, CR2: 0x00004000, CR3: 0x01019000, CR4: 0x000006e0
    EAX: 0x23a3d578, EBX: 0x00000000, ECX: 0x00001000, EDX: 0x00004000
    CR2: 0x00004000, EBP: 0x2544bc18, ESI: 0x23a3d578, EDI: 0x00004000
    EFL: 0x00010206, EIP: 0x0019637c, CS: 0x00000008, DS: 0x00000010
    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0x2544b9d8 : 0x128d08 (0x3cb134 0x2544b9fc 0x131de5 0x0)
    0x2544ba18 : 0x1a429b (0x3d0e4c 0x0 0xe 0x3d0670)
    0x2544bb28 : 0x19ada4 (0x2544bb40 0x23a39578 0x2544bb98 0x84ae50)
    0x2544bc18 : 0x84b148 (0x23a39000 0x2 0x2544bc68 0x1a1738)
    0x2544bc38 : 0x8393d4 (0x2544bddc 0x0 0x2544bc68 0x4b0000)
    0x2544bd18 : 0x6ca33a (0x23a39000 0x2544bdaa 0x2544bdaa 0x84)
    0x2544bd78 : 0x6be697 (0x3c34000 0x2544bdaa 0x2544bdaa 0x84)
    0x2544bdf8 : 0x6a72e3 (0x3c34000 0x1 0x2544be48 0x1a1738)
    0x2544be18 : 0x6aee4a (0x553f8000 0x0 0x3ff96a27 0x3d87)
    0x2544be78 : 0x546b55 (0x3c34000 0x2544beac 0x1 0x1a26ce)
    0x2544bec8 : 0x54a1d0 (0x3a21e00 0x3 0x3f60ddf8 0x3d87)
    0x2544bee8 : 0x54bc8d (0x3a21e00 0x7abf 0x5cbd220 0x5cbd160)
    0x2544bf28 : 0x39c536 (0x3a21e00 0x3a40280 0x8 0x2)
    0x2544bf78 : 0x13d7d9 (0x3a40280 0x3a87e78 0x0 0x0)
    0x2544bfc8 : 0x19ac1c (0x0 0x0 0x19e0b5 0x397fcec) Backtrace terminated-invalid frame pointer 0x0
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.NVDAResman(4.5.2)@0x6c9000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    dependency: com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    dependency: com.apple.iokit.IONDRVSupport(1.4.5)@0x6ba000
    com.apple.iokit.IONDRVSupport(1.4.5)@0x6ba000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    dependency: com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    com.apple.iokit.IOHIDFamily(1.4.10)@0x531000
    Kernel version:
    Darwin Kernel Version 8.9.1: Thu Feb 22 20:55:00 PST 2007; root:xnu-792.18.15~1/RELEASE_I386
    Wed Apr 18 17:06:26 2007
    panic(cpu 1 caller 0x001A429B): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
    CR0: 0x8001003b, CR2: 0x00004000, CR3: 0x01019000, CR4: 0x000006e0
    EAX: 0x23a4d578, EBX: 0x00000000, ECX: 0x00001000, EDX: 0x00004000
    CR2: 0x00004000, EBP: 0x25443c18, ESI: 0x23a4d578, EDI: 0x00004000
    EFL: 0x00010206, EIP: 0x0019637c, CS: 0x00000008, DS: 0x04080010
    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0x254439d8 : 0x128d08 (0x3cb134 0x254439fc 0x131de5 0x0)
    0x25443a18 : 0x1a429b (0x3d0e4c 0x1 0xe 0x3d0670)
    0x25443b28 : 0x19ada4 (0x25443b40 0x23a49578 0x1 0x4065004)
    0x25443c18 : 0x84b148 (0x23a49000 0x2 0x25443c48 0x713bbf)
    0x25443c38 : 0x8393d4 (0x25443ddc 0x0 0x25443c68 0x7116c2)
    0x25443d18 : 0x6ca33a (0x23a49000 0x25443daa 0x25443daa 0x84)
    0x25443d78 : 0x6be697 (0x3c61c00 0x25443daa 0x25443daa 0x84)
    0x25443df8 : 0x6a72e3 (0x3c61c00 0x2 0x25443e28 0x1e)
    0x25443e18 : 0x6aee4a (0x523e0000 0x0 0xfd8e30e2 0xc93)
    0x25443e78 : 0x546b55 (0x3c61c00 0x25443eac 0x2 0x1a26ce)
    0x25443ec8 : 0x54a1d0 (0x3a21e00 0x3 0xfcf5a332 0xc93)
    0x25443ee8 : 0x54bc8d (0x3a21e00 0x1917 0x4336be0 0x4336b20)
    0x25443f28 : 0x39c536 (0x3a21e00 0x3a40280 0x8 0x2)
    0x25443f78 : 0x13d7d9 (0x3a40280 0x3a39ff8 0x0 0x3303)
    0x25443fc8 : 0x19ac1c (0x0 0x0 0x19e0b5 0x5cb2144) Backtrace terminated-invalid frame pointer 0x0
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.NVDAResman(4.5.2)@0x6c9000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    dependency: com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    dependency: com.apple.iokit.IONDRVSupport(1.4.5)@0x6ba000
    com.apple.iokit.IONDRVSupport(1.4.5)@0x6ba000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    dependency: com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    com.apple.iokit.IOGraphicsFamily(1.4.5)@0x69f000
    dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5e0000
    com.apple.iokit.IOHIDFamily(1.4.10)@0x531000
    Kernel version:
    Darwin Kernel Version 8.9.1: Thu Feb 22 20:55:00 PST 2007; root:xnu-792.18.15~1/RELEASE_I386

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    Did someone help you today? Press the star on the left to thank them with a Kudo!
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