Have been resetting PRAM and SMC every now and again when power switched off from wall plug, as iMac will not then switch on normally. So I thought I would change the motherboard 3v battery. Now, nothing. The usual resets do not get it to switch on. How do I reset the firmware to tell the smc to start up again??
I am assuming that firmware for the SMC has been "lost" by the removal of the battery?
Bought about mid 2011. 21.5"
Hiya Dustin. Not sure what model,,just the top of the range in 2011
I think it is an Intel Based machine.
No difference. Can't do either of the usual resetting of PRAM and SMC as the computer does not come on at all.
At an Apple repair shop, a technician mentioned having to reset firmware.
This was my original question. How do I go about resetting firmware or re-installing it?
Yes, ever since I removed the battery, nothing!!!
Previously, unless one went thru the exact routine of unplugging, waiting 30-60 mins, then switching on , waiting about 5 seconds, then pressing power button,,the computer would also stay dead!!
Serial No ;CO2GJ56WDHJN
Am pretty sure it is not the power supply as the one support technician I took the machine to today, put in their power supply module and it also did not switch on
Right, am back.
After I changed the battery no resetting techniques worked.
I then took the computer to a supposed technician who only had a few minutes unfortunately , and he switched power supplies,,but with no success.
Yes, that is the Mac I have.
Could not find any LED's on . That is with the screen removed and the power on. In fact could not actuallu locate the leds as there is a metal strip running the length of the computer where the ram is located.
Anyhow, getting late, so will pack up tonite and see my options tomorrow. The closest Apple service is 500 miles away,,plus they chance their arm and just charge you for whatever, even if it is just a resetting of something small.
Thanks for you help.
Good Day Dustin,
Seems like the power supply is faulty. Put in a test one and it booted up fine,, so have ordered a power supply.