EvoT61 wrote:nothing is happening, i disconected bios battery and still nothing , Fn keys does not work either .
If the machine won't post, it sounds like the flash failed. This can happen if it's interrupted, or if the disc isn't burned 100% perfect, or if the optical drive is defective or the computer unstable.
Short of manually burning the bios chip which would require special equipment, you may need a new motherboard.
I prefer to flash the bios from within windows. I have a harddrive with 32bit windows that I use for testing and flashing all my T61 boards. You also don't have to worry about the machine rebooting and reflashing the bios over again... each time introducing more risk into the equation.
If you do want to update from a boot disc, I'd verify the burn multiple times to be sure there are no errors. It's also important to note that a burn isn't always "good vs bad", there are also "sloppy" burns that can pass verification but still have read errors. Anyone who's burned a lot of video discs will know that a disc burned at fast speed may pass verification, but can have playback issues compared to one burned at a slow speed.