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Helpful answers
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Jan 15, 2015 3:20 PM in response to Web dudeby Niel,1. Give up. A PowerPC G4 or G5 Mac can’t be upgraded past Leopard 10.5.8.
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Jan 15, 2015 3:23 PM in response to Web dudeby Japib,there is no 2007 iMac G4. Anyway, if your iMac is a "G3" G4 or G5, you can't upgrade to Yosemite, it's too old.
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Jan 15, 2015 6:49 PM in response to Web dudeby Allan Jones,★HelpfulI you are unsure about the actual model (you do have a severe conflict between the processor type and the year you report) you can enter the serial number into this web site:
http://www.everymac.com/ultimate-mac-lookup/
and it will translate the number into a model designator. You can also do "About this Mac" from your Apple menu to get this window:
If the "processor" line includes the phrase "PowerPC" as in the image, there is no way under the sun to run any Mac OS higher than 10.5.8. Is it IS a 2007 iMac, it may be able to run Yosemite but your will need to max out the RAM and performance could still be sluggish.
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Jan 19, 2015 4:30 PM in response to Web dudeby a brody,The only 2007 iMac that can run 10.10 is the mid-2007 (from August 7th) model. That said, upgrading it past 10.6.8 has these pitfalls:
