This is a method originally described by REDALERTHAN, this post is to clarify and make sticky as many users have been unable to follow his instructions. Most if not all DELL bioses on systems are based on the phoenix bios. The phoenix bios contains an emergency bootloader in case the actual bios becomes corrupt or the bios update fails. I have successfully used this method to recover 2x Vostro 1400 mainboards, and various other models. 1.) Firstly download from the DELLs website the latest version of your BIOS, for me this was 1400_A09.exe, then copy it to C:\ 2.) Open a Windows (MSDOS) command prompt, and type (replacing the name of my bios file with yours) 1400_a09.exe -writehdrfile Now you will find the file “1400_a09.hdr” @ C:\ on your PC. 3.) You now need to copy this to a formatted USB stick (FAT format), only this file. (Some models only accepted USB floppy drives) I found that a FAT formatted 128mb USB disk worked, my 2GB stick didnt seem to work (further testing to be confirmed). It usually worked in most USB ports although one model I noticed only worked on the left hand side. (Vostro 1400) 4.) Remove the battery and the AC power cord. 5.) Plug in the USB memory stick into one of the USB ports. 6.) Whilst holding down the END key plug in the AC adaptor, 7.) The battery light should come on, on the Vostro it came on purple (i suppose green and RED at the same time) (other model use different colors, but the timing seems to be uniform across all models.) 8.) Then release the END key, the power light should come on and the laptop power up, wait a moment ensuring the power stays on, hopefully the USB stick will start to be read. The LEDs will start flashing different colours and the fans should be on loudly. Eventually the laptop should automatically restart itself. If all has gone well then the DELL logo should be displayed. The entire flashing process probably takes less than 30 seconds, it is very fast. Confirmed models: Inspiron 1525 – Confirmed (28/04/2010) Inspiron 6400 – Confirmed (28/04/2010) (Hold END until the power LED comes on then let go, flashing worked with memory stick in any port.) Latitude D410 – Confirmed (File must be named VENI????BIN or VENI????HDR, i.e. VENI1234.BIN or VENI1234.HDR) Latitude D610 – Confirmed (File must be named AZED????.BIN or AZED.HDR, i.e. AZED1234.BIN or AZED1234.HDR) Latitude D620 – Confirmed Vostro 1400 – Confirmed (27/04/2010) Please if anyone can confirm this works for them on any other model of DELL the please email me and I will add this to the list. I am also keeping an updated notice of this technique on my blog to help make this information more readily available.