Hello everyone; I use a Dell N5010 exactly service tag number is FJ7P3N1 When I was trying the downgrade bios from A15 to A07 it shut down. And computer dont work now. When I pushed the power button I heared this sound Beep -1sec Beep 1sec Beep I trying everything here. Steps 1- I download the latest bios n5010a15.exe 2- I change it to rom on bios n5010a15.rom 3- I change it to hdr n5010.hdr 4- Copy them it to 4gb usb flash memory (FAT) 5- Press End and take it power cable. (DOESN'T WORK) I trying the Windows + home and CTRL+ESC Please help me because I educate in an university and I must finished my homework on tomorrow. Sorry for my bad english. Waiting your HELP.