Can a spent CMOS battery interfere with a startup on an iMac?

By rodion15
Sep 4, 2015
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  1. I have an iMac that doesn't start up, neither from any bootable usb device, bootable CD etc (you can see the startup manager icons and you when you click one you see the progress bar but it stops there.
    The Apple troubleshooting procedure (GSX service guide) advices me to check that the motherboard battery isn't spent, the reason why I ignore. Can the CMOS memory hold some setting that may halt the startup???

    Last edited: Sep 4, 2015
  2. mailpup

    mailpup TS Special Forces Posts: 6,964   +355

    Rodion15, do not shout, please.
    learninmypc likes this.
  3. Cobalt006

    Cobalt006 TS Evangelist Posts: 1,777   +241

    Your answer is no. Cmos battery goes it just won't let the bios keep it settings Such as time. Other than that. The said computer should boot.
  4. rodion15

    rodion15 TS Booster Topic Starter Posts: 127

    OK, thanks for your answer, that's what I thought, that's why I found it odd this troubleshooter having me check the battery.
    Sorry about the shouting (removed).
  5. mailpup

    mailpup TS Special Forces Posts: 6,964   +355

    Thanks, rodion15. :)
  6. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,689   +395

    Reset the PRAM (command+option+P+R). Shut down the machine, hold those keys, turn it on (or get on them before display comes up), keep holding until reboots and you get the chime, then let go.

    Reset SMC, shut down, unplug, hold power button down for 5-10 seconds (5, but do 10 just to be safe), plug back in boot up.

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