Dell 8400 X300 128MB BIOS P/N 113-A33406-100 error

This might be caused by hard-drive failure. You should run hard drive test from BIOS to make sure hard drive is ok. You can access BIOS by pressing F2 during start up, from there start hard disk self test and wait for it to complete.

If hard drive is ok after test, insert in your original Windows installation media and reinstall OS.

you might need to update your bios contact the dell website for a possible update

hope this helps

Hello here from dell:

http://www.dell.com/support/drivers/us/en/19/Product/dimension-8400

Good luck

no problem friend please open your cpu shutter and you can see here a cell like watch's cell plug it out and replace it with the new one and start your computer now your this problem is 100% solve. thanks

go to www.dell.com and check for a bios update if one is not present contact support and tell them your problem

It sounds like your bios were improperly flashed or went bad. The X300 SE message is your video card. So your video card works, the system mostly works, but the BIOS isn't starting up. You should contact Dell and tell them the situation.

Hello my friend probably is a bios setting,somehow you hit default settings or flash your bios and you turned it on.Go into bios(hitting del on boot) and on the general page there will be a setting for a floppy drive, likely something like floppy 3.5" 1.4mb choose it and hit enter and you should be able to disable the floppy drive.If there is no setting, look for a HALT ON ALL ERRORS setting and change it to keyboard onl.

What can cause this error?

Well, this is the problem since quite a variety of problems can trigger the error.

1: the bios can be malfunctioning (a bios reset or flash can give a solution)
2: the cpu can be malfunctioning (this requires a new cpu)
3: the cpu socket can be failing (this requires a new mb)
4: the problem can be with bad usb sockets
5: even a bad uplink to a usb hub can cause this error to appear.
Did you change your monitor lately? I would chase down the USB things first...that and the monitor seem to trip the trigger...
Hope this get you started- I think you were right on target with the flash of the BIOS-try it again using the BIOS flash downloaded from the dell site...and to run the chipset again...it just might
Good luck my friend, hope this helps, please leave rating, thank you kindly

You need to reset your bios settings. Open your case and remove the cmos battery for 10 minutes. Caution: unplug all ac plugs before you open your case. put the battery back in and turn it on you should see an error message saying: you need to set system time and date. If you see this then you have successfully reset your bios settings and the defaults should load up. follow the instructions to change your time and date settings and save. reboot and hopefully you can boot up. I hope this works.

Sounds to me like the hard drive is bad.Download some testsoftware that does not require windows and test it. 

http://www.seagate.com/www/en-us/support/downloads/