[lepauk]

I purchased an ASUS P8Z68-V PRO/gen3 and a Core i5 2500k CPU. On begining I used automatic overclock settings (AI Suite II - Auto Tuining -Extreme) ,

Results:

Results are terrible, unstable, still restarting system, crashing application etc.

I tried to come back to default settings:
First
pressing F5 to comeback to Optimized Defaults - NO result after restart always back to Manual OC settings even if I chose Auto
Second
I turn OFF the computer and unplug the power cord then I move the jumper cap from pins 1-2 ( default ) to pins 2-3. for about 10 seconds, then move the cap back to pins 1-2.

NO RESULTS (clock and date restart but even OC profiles I saved remain unchanged)
I repeated without battery - no results
Then the same but with motherboard-power supply connectors unplugged for 20 hours without battery, no results

Always back to Manual settings shows on screen shots, I tried to X.M.P. mode and always after restart back to Manual, from Auto to Manual as well.
I flash BIOS from EZ flash and from windows AI suite, all the same.
Tried new system without AI suit installed, I try to use computer without battery at all,
NOOOOOOOOOOOOOOTHING helps
Now i temporary after each restart I manually changing settings in AI Suit:

after each restart always back to manual oc settings.

Anything else i can do?

My system:
ASUS P8Z68-V PRO/gen3
i5 2500k
8GB Corsair Vengeance
Antec TruePower 750W

[Pikeyp]

I think the settings you have in the ASUS AI suite are over-riding the BIOS when you boot up, and somehow are 'stuck'!

So start by un-installing the AI suite.
it might be an idea to run CCleaner (just the registry cleaner ... ) at this point.
Then try to change settings back to default in the BIOS (f5 .... optimized defaults)
re-boot and see if this works! I realise you may have tried this already , but lets see how we go!

If that doesn't work , try something outrageous in the BIOS so that the machine refuses to boot ... perhaps upping the 'Memory Frequency' to something too high!

Now re-boot your machine and you should see the first screen prior to the BIOS .. black with white text listing your hardware etc, etc , and at the bottom of this a message saying something like 'Overclocking Failure ... press F1 to enter BIOS' .. **don't press F1 at this point**

Instead , press the ON/OFF button on the front of your machine for several seconds ... this *should* reset your BIOS to defaults , and just might fix your problem!

I say *should* because I've read about this before but can't remember where .. but it seems to work!