Imac shutting down unexpectedly after 20 minutes

G3 imac with 10.4 OS screen does blank and on-off switch start 'fluttering' quickly and cannot restart unless computer has been shut off for 30 minutes.
Tried to reload 10.4 from CD but computer shuts down before fully loaded?
Is this a hardware or software problem?
Any advice?

I'd suggest you try asking in the iMac (CRT) area. This forum is for the new Intel-based iMac Core Duo and so perhaps not the most likely place for you to get a quick and accurate response.
Good luck.

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    21. des. 2014, 19.07.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
    21. des. 2014, 19.08.25 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
    21. des. 2014, 19.08.25 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
    21. des. 2014, 19.08.32 mdworker[18669]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.08.33 mdworker[18669]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.08.33 mdworker[18670]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.08.33 mdworker[18670]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.08.33 mdworker[18671]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.08.33 mdworker[18671]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 19.09.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
    21. des. 2014, 19.09.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
    21. des. 2014, 21.00.20 distnoted[1293]: # distnote server agent  absolute time: 130.864989531   civil time: Sun Dec 21 21:00:20 2014   pid: 1293 uid: 506  root: no
    21. des. 2014, 21.00.35 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283710070
    21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8285102890
    21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283505850
    21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283715960
    21. des. 2014, 21.00.37 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8285106d90
    21. des. 2014, 21.00.37 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f828500cad0
    21. des. 2014, 21.00.50 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e19a80
    21. des. 2014, 21.00.54 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f0b080
    21. des. 2014, 21.00.54 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0c21a40
    21. des. 2014, 21.00.55 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0d214b0
    21. des. 2014, 21.00.55 mdworker[1305]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 21.00.55 mdworker[1305]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
    21. des. 2014, 21.01.10 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe33066f0
    21. des. 2014, 21.01.14 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3106470
    21. des. 2014, 21.01.15 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f04f10
    21. des. 2014, 21.01.15 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3207780
    21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e1f0c0
    21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe33104b0
    21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e21a10
    21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e152e0
    21. des. 2014, 21.01.58 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.11 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.14 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.14 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3107a10
    21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0c237d0
    21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0d2a470
    21. des. 2014, 21.02.18 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.02.57 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3105ab0
    21. des. 2014, 21.02.57 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f025c0
    21. des. 2014, 21.03.00 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f029c0
    21. des. 2014, 21.03.00 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.03.00 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.03.02 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)
    21. des. 2014, 21.03.02 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal  Threw error #203 (Duplicate property or field node)

    I have a similar issue with my older MacBook Pro 3,1 since Mavericks.  In Mavericks it would completely freeze.  In Yosemite it reboots.
    On my machine somehow it is tied to whether I have Wifi turned on or off (whether associated with a connection or not).  I typically use my computer near the router and turn off the wifi.  Since Mavericks if I turn off my Wifi, it will eventually crash so I have to manually disassociate but leave wifi on to keep my computer from crashing.  Not sure where the [com.apple.calendar.store.log.caldav.coredav] errors fit in but I always see them shortly before a crash if wifi is off.

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