On my Z77A-G45
(Ivy Bridge), I've found that to get a full CMOS reset
(clear time and date) a special combination of both methods are required. I've tested a few times and found the following to work 100% of the time:
Please read each step carefully, same as the original post. As with the original post, I, nor this forum can be held responsible if you damage your system.
However, I have tested this 5 times on my MSI Z77A-G45
(each time, I'd set the time to something random so that I knew the time was being reset).Do not skip any steps!
Disconnect the main AC power by either shutting off the power switch on the back of your power supply or simply pulling out the power cable.
With Power supply switched OFF or Disconnected, press power as if you were going to power up the board.
For my specific board and case, it will wait about 2-5 seconds then try to turn on, lighting up the power LED. This LED then slowly fades off.Wait at least 20 seconds
after pressing power before proceeding to step 3.
Remove the CMOS battery
This part is a little tricky, as you will need a jumper
, possibly from another device.
MSI does not provide any with the Z77A-G45, as they are not required for everyday usage, and JBAT1 is only 2 pins, which are to be unbridged during normal usage.
Bridge JBAT1 by placing the jumper on the 2 pins.
While the jumper is on JBAT1, press and hold
the clear CMOS button on the back of the I/O panel for 10 seconds
(I've found 10 seconds to be the most reliable. 3 seconds only reset the date and time once out of 3 tests, where 10 seconds worked 5 times out of 5).
After 10 seconds, release the button, and remove the jumper
from JBAT1. Do not forget this!
Replace CMOS Battery
Switch on or plug power supply back in, and start up your system. You will get the "Press F1 to enter setup", and your time should be set to 00:00.
On my MSI Z77A-G45
, I've found I had to use both JBAT1 and the reset button to get a full clear.
This wipes all the settings, and the date & time, but does not seem to wipe the "Overclocking Profiles".
Also, regarding step 4, you may be thinking that you can just short JBAT1 with anything conductive (such as a small flat head screwdriver). Technically you could
do step 4 without a jumper.
However, I would not recommend this because it may be difficult to short the pins AND hold the reset button simultaneously. Your hand may slip in the process, and could damage the board.