Hi singh_uk (nice to see another sikh from uk on here ), I managed to solve my black screens eventually after a couple of days. I'm not quite sure how I did it in the end, I just kept following his guide repeatedly until suddenly I noticed that everything was working. I noticed that you said that you flashed with the relaxed memory timings. I know for certain that I always kept my timings at 4-4-4-12 while flashing and eventually it worked for me using the tigher timings, never tired with the more relaxed timings of 5-5-5-15. I have now been experimenting with overclocking and changed a lot of my bios settings and never had the blank screen or "overclocking failed" messages again. As you can see from my sig, we have got nearly identical systems. I have uploaded the bios settings that worked perfect for me and managed to solve my problem: http://www.sitalchauhan.pwp.blueyonder.co.uk/Other/WORKING.CMO You need to put the .CMO file onto a usb thumb stick, and reboot with the usb drive plugged in. In the bios, go to tools > Asus O.C. Utility, and then load the settings from the file. I have a vauge memory that I got mine to work when I had both sticks plugged in, did a cmos clear, loaded the above settings still with both sticks plugged in, flashed the 0311 bios, and then just rebooted. All of my custom settings were still in after the flash and everything was working ok.