IMac shuts down after removing Mini DisplayPort to SVGA

Hi,
The last couple of years I have worked with a 27 inch iMac in combination with a HP 27 inch monitor. This monitor is connected via a Mini Displayport to SVGA connector. Because I am going to use this external monitor anymore, I disconnected it today which made my iMac shut down imediately. Then it keeps rebooting and trying to start up but shuts down again. Over and over.
The problem stops as soon as I connect the monitor again.
Anybody have any thoughts?

Hello there, TheCapGuy.
The following Knowledge Base article is a great resource for steps in troubleshooting spontaneous restarts:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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Imac Shuts Down after 1 min

Hi
My intel mac is about a year old now, it has been used daily and doesnt normally get turned of or put to sleep it just looks after itself. Recently it has begun to turn off, not go through the shut down process but just turn off. To restart the power must be turned off at the plug and then back on, the start button pressed I may then get 30 seconds to a minute after start up before it urns off again.
Does anyone have any ideas? Know of any safe star modes or such. Any and all help appreciated.
Regards
Ian

Several logs in the info file , this is the "panic.log"
Description: Panic (system crashes) log
Size: 3.92 KB
Last Modified: 19/01/2007 13:07
Location: /Library/Logs/panic.log
Recent Contents: Mon May 15 08:04:42 2006
panic(cpu 0 caller 0x0019CAEF): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
CR0: 0x80010033, CR2: 0xe000038b, CR3: 0x01632000, CR4: 0x000006e0
EAX: 0xe00002e7, EBX: 0x03a67283, ECX: 0x03a67283, EDX: 0x032a5000
ESP: 0xe000038b, EBP: 0x0be1bd08, ESI: 0x0327a48c, EDI: 0x032a0800
EFL: 0x00010213, EIP: 0x268874d4, CS: 0x00000008, DS: 0x00000010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0xbe1bbc0 : 0x128b5e (0x3bbeb8 0xbe1bbe4 0x131bbc 0x0)
0xbe1bc00 : 0x19caef (0x3c1340 0x0 0xe 0x3c10f8)
0xbe1bcb0 : 0x197b53 (0xbe1bcc4 0xbe1bd08 0x268874d4 0x48)
0xbe1bcbc : 0x268874d4 (0x48 0x2e70010 0x32a0010 0x10)
0xbe1bd08 : 0x268895fa (0x27f3000 0x3a67283 0xbe1bd38 0x3ae082)
0xbe1bd38 : 0x3a3045 (0x32a0800 0x3a67283 0x327a48c 0x327a490)
0xbe1bd88 : 0x18a1e5 (0x32a0800 0x6 0x35b0ec4 0x1)
0xbe1bdd8 : 0x12b389 (0x35b0e9c 0x327a464 0x0 0x0)
0xbe1be18 : 0x124902 (0x35b0e00 0x0 0x30 0xbe1befc)
0xbe1bf28 : 0x192efc (0xbe1bf54 0x0 0x0 0x0)
0xbe1bfd8 : 0x197fa6 (0x2f7d920 0x2f7d920 0x3a67283 0xe000038b) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xb0220698
Kernel loadable modules in backtrace (with dependencies):
com.apple.ATIRadeonX1000(4.2.6)@0x26882000
dependency: com.apple.iokit.IOPCIFamily(2.0)@0x1be85000
dependency: com.apple.iokit.IOGraphicsFamily(1.4.3)@0x2683d000
dependency: com.apple.iokit.IONDRVSupport(1.4.3)@0x26873000
Kernel version:
Darwin Kernel Version 8.6.1: Tue Mar 7 16:55:45 PST 2006; root:xnu-792.9.22.obj~1/RELEASE_I386
Fri Jul 21 07:47:44 2006
panic(cpu 1 caller 0x0019CADF): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0xa3a22088, CR3: 0x00d1d000, CR4: 0x000006a0
EAX: 0x09d11044, EBX: 0x02c5bc04, ECX: 0x01b03000, EDX: 0x0296a000
ESP: 0xa3a22088, EBP: 0x0b443b84, ESI: 0x02c5bc14, EDI: 0x00000000
EFL: 0x00010282, EIP: 0x01c990ab, CS: 0x00000008, DS: 0x00000010
Backtrace, Format - Frame : Return Address (4 potential args on stack) Unaligned frame
Backtrace terminated-invalid frame pointer 0xb4439ef
Kernel version:
Darwin Kernel Version 8.7.1: Wed Jun 7 16:19:56 PDT 2006; root:xnu-792.9.72.obj~2/RELEASE_I386
Fri Jan 19 13:07:54 2007
panic(cpu 0 caller 0x001A3135): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x00000000, CR3: 0x00db2000, CR4: 0x000006e0
EAX: 0x02f92000, EBX: 0x01f4df8c, ECX: 0x01f4df94, EDX: 0x020a1ec0
CR2: 0x00000000, EBP: 0x0b6abe38, ESI: 0x0068bcc8, EDI: 0x02159480
EFL: 0x00010202, EIP: 0x00000000, CS: 0x00000008, DS: 0x1ff40010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0xb6abc78 : 0x128d1f (0x3c9540 0xb6abc9c 0x131df4 0x0)
0xb6abcb8 : 0x1a3135 (0x3cf1f4 0x0 0xe 0x3cea24)
0xb6abdc8 : 0x19a8d4 (0xb6abdd4 0xe 0x2570048 0x2f20010)
0xb6abe38 : 0x67c92b (0x1f4df8c 0x68bcc8 0xb6abe78 0x2f24e00)
0xb6abe58 : 0x67c9a0 (0x2f24e00 0x1f4df8c 0xb6abe98 0x3bdf77)
0xb6abe78 : 0x1ff4e7dc (0x2f24e00 0x1c08cc0 0x1e71300 0x2f24e00)
0xb6abe98 : 0x38748a (0x2f24e00 0x2f0dc00 0x5 0x199c36)
0xb6abed8 : 0x397b17 (0x2f0dc00 0x5 0x2f2fd80 0x0)
0xb6abf08 : 0x387340 (0x1d5ae80 0x3873e4 0x2f0dc00 0x5)
0xb6abf58 : 0x38adf6 (0x2f2fd80 0x0 0x0 0x0)
0xb6abfa8 : 0x38b21d (0x5 0x38b1fc 0x5 0x4b7000)
0xb6abfc8 : 0x19a74c (0x5 0x0 0x19d0b5 0x1d89b70) Backtrace terminated-invalid frame pointer 0x0
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBMassStorageClass(1.4.5)@0x1ff4c000
dependency: com.apple.iokit.IOUSBFamily(2.6.1)@0x515000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.5.1)@0x677000
dependency: com.apple.iokit.IOStorageFamily(1.5.1)@0x601000
com.apple.iokit.IOSCSIArchitectureModelFamily(1.5.1)@0x677000
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386

Mac shuts down after 10 Min.

My mac shuts down automatically after 10 Min., I must sign in again and the movie or whatever I just watch is still on in the back.
How can I prefend this cutoff?
I read all the comments, but no help. Even if I turn off the Mac or unplug it, it does not help.

No, did not help. I take it to the store. Thanks anyway.
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IMac shuts down after removing Mini DisplayPort to SVGA

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