I dualboot between Windows 7 and Ubuntu. The disaster happened when I tried to replace Ubuntu with another flavour of Ubuntu (wanted to see how it handles Chinese input). I was in Windows. I had what I wanted to install inside my USB stick. I deleted Linux partitions using EaseUS, then recreated them as EXT3 partition. I had previously given USB flash disks boot priority over HDD, so I rebooted with my USB stick plugged in, thinking it would boot from USB. (This is how I installed Ubuntu in the first place.) Only I did not boot up this time. I got stuck at BIOS information screen. I could not enter setup. I must have messed up when I removed one of the Linux partitons. So ... I am on my mobile phone now asking for help. I have taken a screenshot of where I am stuck. Any help is greatly appreciated.