ASUS Z77 Motherboards - Official Support Thread

[p3gaz_001]

Which UEFI (BIOS) version and which slots are you using? For a dual channel kit use A2 and B2. Use a single module to update to the latest UEFI. If the XMP profile is not stable on the latest BIOS you may have a weak IMC, in which case try using some of the looser memory presets and see if that encourages POST. If it does not, then I'd possibly peg back to DDR3-2200 or so with tighter timings (it will be faster than forcing very loose timings to get DDR3-2400 working).

i'm using 0703 bios ..... and B1 / B2 memory slots, the red ones. i'll try right now with your tips!