Welcome to Tom's Forum!
The idea of the 'fix' is simple ... doing it not so much. The IB requires an updated BIOS to post with the new Ivy Bridge CPU. Choices:
1. Donor Sandy Bridge CPU used to update the BIOS to the latest revision.
2. RMA & Exchange the Z68 or it's equivalent Z77 the ASUS P8Z77-V Pro
3. Have a PC shop update the BIOS
4. RMA the ASUS P8Z68-V Pro to ASUS for a BIOS upgrade (Cross-Ship/different MOBO or Wait ~30 days)
Any of the above is going to incur some for of cost (Labor or Shipping) unless you have an older Sandy Bridge LGA 1155 CPU in another system or can borrow a SB CPU for free.
Q - on the MOBO's box what BIOS version is listed?