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Helpful answers
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Jul 1, 2012 1:10 PM in response to filmboomerby Kenichi Watanabe,★HelpfulThat iMac G5 would be from 2005, if it's this one
http://www.everymac.com/systems/apple/imac/specs/imac_g5_1.9_17.html
It could be a hardware problem. However, you should reset PRAM, if you have not already.
http://support.apple.com/kb/HT1379
Also, reset SMU (power management). This is the procedure for an iMac G5
http://support.apple.com/kb/HT1767
When you reconnect it back to power, if it was previously connected to a "power strip" of some type (especially if it's old or overcrowded), try connecting it directly to a wall outlet, by itself. Start it up with nothing else connected initially, then connect only a standard mouse and keyboard. Use it that way for a while, to see if there is improvement. Some USB devices (whether faulty or not) can cause "interference."
A weak or dead PRAM battery can cause odd issues, but most of those seem to related to be starting up.
I used to be able to push a combination of buttons at start-up that would open any Mac to a diagnostics page where I could go from there.
You can run a hardware test, but you need to insert the disc that came with the iMac. I believe you then start up with the Option key held down, to see the option to run the hardware tester.
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Jul 1, 2012 3:24 PM in response to Kenichi Watanabeby filmboomer,I'm mid-move of homestead so am separated from my operating discs.
I'm thinking your suggestion of my doing a hardware test is related to the PRAM battery. That will have to wait.
What I can and will do is the PRAM reset and somewhere find a speed test. I am pretty sure my problem began with the operation being so slow it looked stopped.
THANK YOU! That's what I like: instant help!
Tom
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Jul 1, 2012 3:54 PM in response to filmboomerby Kenichi Watanabe,I know of no "built-in" hardware tester that you can invoke by holding down keys at startup. It comes on the disc that came with the Mac.
There are other startup options, such as Safe Boot (hold Shift key during startup), but they do not test the hardware. You may want to try that
http://support.apple.com/kb/HT1564
to see if it makes a difference in your video issues.
There are third party utilities, such as TechTool Pro, that test some hardware in general ways, but not specific hardware, such as the components of an iMac G5.