The Intel Support article here: Desktop Boards — Troubleshooting BIOS issues
States that it is applicable to the DZ77GA-70K.
But I don't think that the battery can be removed with a screwdriver.
Just wanted to note.
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- Unplug the power supply.
- open chassis taking all necessary precautions to avoid electrostatic discharge and personal injury
- locate CMOS jumper **see image below
- move the jumper from 1,2 to 2,3
- plug in the power supply and boot the system
- after post the setup runs automatically
- press F9 to restore defaults
- save and exit
- power down system and move the jumper back to original position.
Okay, I think its time to better illustrate the issue at hand ;-)
I searched for some pictures (hope the hotlinking works) and made some myself of neweggs flash viewer thing.
So, here are the direct links:
1. Classic mainboard with battery tray I used to know
2. Another one. Please note the metal latch.
3. Latch and tray with battery removed would look similar to this
4. This is a current Z77 based mainboard, which has been released recently
5. Close up of the battery tray. The latch is closed. Also a current generation mainboard.
And now the Intel board:
6. No latch, but a plastic cover on top of the battery
7. Same board, slightly different angle.
The difference is quite easy to see.
I would like to hear from Intel about this design choice ;-)