Halp, P8p67 pro b3 flashing nightmare

I flashed it to 2103 due to problems i was having getting it to boot with 2 sticks of ram in and that it was constantly saying overclock failed - even though it was all at stock and the "turbo" feature turned off.
Now it doesn't boot up just dies after about 4 seconds of blackscreen. I've popped the CMOS battery and then when i start the comp up says i have to go into setup to choose bios settings. if i exit without saving, it boots into windows if i flash it again to 2103 just says restart and back to black screen again. also tried to windows flash to 2103 and 1704 and when it restarts just takes me back to setup again, save and exit... black screen mode. and i can't revert back to 1704 in bios as it says it's and older version Windows lets me flash it to 1704 but when it restarts says in BIOS still on 2103

HELP! this is driving me nuts....don't have original mobo CD with me as have moved, if that would help? rang up asus support to find out mobo support is email only and didn't fancy a 12 year exchange

Intel Core i7-2600K 3.40GHz
2x4gb ripjawsx f3-12800CL8D 1.5v
6950 flashed to 6970
Coolmaster 850W


Any help is greatly appreciated! Thanks