|You basically setup a floppy bootdisk with the update files to run without any user input. Here is the general procedure:|
The configuration jumper number may not be the same as on your motherboard.
I downloaded BIOS_GATEWAY_SE91510J.15A.2609_A_A.ZIP, the bios update file shown for the E4300 which I guess is what you used for the update. I unzipped it and took a look. There's a dos folder there with three files in it--the bios update file, the flasher to install it and an autoexec to start it. You should be able to add those files to a dos bootdisk to do the install.
The best way would be to use the SYS command from a windows 98 machine to create a basic bootdisk and then add those three files to it. Then make sure the configuration jumper is in the RECOVERY position--I think that's usually 'no jumper' but you need to verify that for your motherboard. Then put the bootdisk in and start up the Gateway. Because nothing shows on the screen you may not know when it's done so just allow a few minutes even after you think it's done.
But first, did you try clearing the cmos as riider suggested? Or try both video ports if you've added a video card?
If you want to go ahead then double check again that you've got the right update file.
I can probably make a floppy bootdisk image file with the updates and email it if you're not sure about that part. Just let me know which update file you plan on using.