My imac g4 starts up then suddenly shuts down

I have an old g4 , the kind shaped like half a golf ball, which starts up and then quits at different places during the process. Sometimes with the gray screen and Apple logo, sometime later when the OS has fully installed,but fails quite rapidly after that. Then tries to reboot itself with varying degrees of failure.
Any help??

( note to self)
DO NOT buy any more Apple products.
Yep, after being a Mac fan for the better part of 20 years, the bloom is definitely off the rose. The last 3 machines I've had have been plagued with problems.Imac g4, bad power supply Ibook, bad logic card. original Imac, bad internal modem, bad dvd/cd. although the community is very supportive, the worst thing is the arrogance..Yeah I said it,of Apple. Because I live in central America, I have never been able to get reliable part and/or service.
The litany: 'sorry sir, your 5 year old machine is too old, we can't service it/ find you replacement parts. Sorry.Kiss our corporate ***)
OK then. Apple is just another big, corporate entity...
Bye bye

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HT6001 my mac has started freezing and suddenly shutting down on me it seems as if every process has slowed down since downloading this last update of 11.1.4, any solutions? Because it shut down in the middle of a test twice now, saying keyboard issue.

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What you describe sounds like a hardware issue. Unfortunately, you'll need to get that checked out by Apple. If you have an Apple Store near you, make an appointment with the Genius Bar and take the machine in for evaluation.

My computer starts but then immediately shuts down

Computer starts but quickly shuts down.

could be a broken cpu fan
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hello all
i have a problem with my itunes, i plug in my ipod (it recognizes it and starts syncing) but after a few moments it tell me itunes has detected a bug and must shut down. Result: cannot synch ipod.
this does not happen when i don't plug the ipod in (itunes works fine then)
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Also see:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues

On windows PC, itunes starts up then immediately shuts down

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IMac suddenly shutting down

Below is what my iMac tells me when it suddenly shuts down or freezes. Does this mean anything to anybody. Quite frustrating. I don't want to buy a new machine if there is some fix for this but I also cannot afford to be without my machine while it is in the shop for a look under the hood.
Any suggestions would most appreciated.
Thaks
Interval Since Last Panic Report: 946299 sec
Panics Since Last Report: 1
Anonymous UUID: C6A31E5E-0055-4BC4-8DCC-FC27D1FE8CB5
Tue Aug 31 08:20:44 2010
panic(cpu 1 caller 0x28d59c): "pmapflushtlbs() timeout: " "cpu(s) failing to respond to interrupts, pmap=0x84b6e0 cpustorespond=0x1"@/SourceCache/xnu/xnu-1504.7.4/osfmk/i386/pmap.c:3548
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x434ab9f8 : 0x21b455 (0x5cf328 0x434aba2c 0x2238b1 0x0)
0x434aba48 : 0x28d59c (0x58d740 0x84b6e0 0x1 0xf5067c)
0x434abab8 : 0x292a68 (0x84b6e0 0x0 0x1 0x42e1a000)
0x434abbe8 : 0x2937b9 (0x84b6e0 0x42e17000 0x0 0xfea170b8)
0x434abc58 : 0x2608ee (0x84b6e0 0x42e17000 0x0 0x42e1b000)
0x434abd88 : 0x260e89 (0x42e1b000 0x0 0x1 0x0)
0x434abdc8 : 0x259c63 (0x2645ebc 0x42e17000 0x0 0x42e1b000)
0x434abe08 : 0x495bca (0x2645ebc 0x42e17000 0x4000 0x67084b4)
0x434abe28 : 0x495ce6 (0x2a7007c 0x887f0d0 0x434abe58 0x2f7006)
0x434abe58 : 0x495d48 (0x711e598 0x20 0x434abe88 0x4f9da8)
0x434abe88 : 0x4696fc (0x68f7cd8 0x434abed8 0x3c 0x0)
0x434abef8 : 0x46b4ad (0x7158790 0x68f7cd8 0x711e540 0x37b)
0x434abf38 : 0x46b57e (0x0 0xe 0x434abf5c 0x1)
0x434abf78 : 0x4edaf8 (0x711e540 0x6aa9a68 0x702e594 0x0)
0x434abfc8 : 0x29f43d (0x6aa9a64 0x1 0x10 0x8b86680)
BSD process name corresponding to current thread: vmware-vmx
Mac OS version:
10F569
Kernel version:
Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386
System model name: iMac5,1 (Mac-F4228EC8)

This line in the panic report:
System model name: iMac5,1
indicates that yours is an Intel imac and much newer than the ones covered in this forum. Any hardware issue you have may not affect the older machines. The labeling of this forum is prety vauge, so it's not your fault. Suggest you repost in the Intel iMAc forums here:
http://discussions.apple.com/category.jspa?categoryID=189
As the panic report suggests a hardware problem, the people in the other forum may see something familiar. You may also wish to review this excellent article on kernel panics, which is what you've experienced:
http://thexlab.com/faqs/kernelpanics.html

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This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

My imac g4 starts up then suddenly shuts down

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