With motherboards that use \"Boot Block Bios\" it is possible to recover a corrupted bios because the boot block section of the bios, which is responsible for booting the computer remains unmodified. When an AMI bios becomes corrupt the system will appear to start, but nothing will appear on the screen, the floppy drive light will come on and the system will access the floppy drive repeatedly. If your motherboard has an ISA slot and you have an old ISA video card lying around, put he ISA video card in your system and connect the monitor. The boot block section of the bios only supports ISA video cards, so if you don\'t have an ISA video card or your motherboard does not have ISA slots, you will have to restore your bios blind, with no monitor to show you what\'s going on.
AMI has integrated a recovery routine into the boot block of the bios, which in the event the bios becomes corrupt can be used to restore the bios to a working state. The routine is called when the system block of the bios is empty.
The restore routine will access the floppy drive looking for a bios file named AMIBOOT.ROM, this is why the floppy drive light comes on and the drive spins. If the file is found it is loaded into the system block of the bios to replace the missing information.
To restore your bios simply copy a working bios file to a floppy disk and rename it AMIBOOT.ROM, then insert it into the computer while the power is on. The disk does not need to be bootable or contain a flash utility. After about four minutes the system will beep four times. Remove the floppy disk from the drive and reboot the computer.
The bios should now be restored
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Recovering A Corrupt Award Bios
To recover an Award bios you will need to create a floppy disk with a working bios file in .BIN format, an Award flash utility and an AUTOEXEC.BAT file. Award bios will not automatically restore the bios information to the system block, for this reason you will need to add the commands necessary to flash the bios in the AUTOEXEC.BAT file. The system will run the AUTOEXEC.BAT file, which will in turn flash the bios. Here are the steps you need to take:
1) Create a bootable floppy disk.
2) Copy the bios file and flash utility to the diskette.
3) Create a text file with any standard text editor and add the following lines
@ECHO OFF
FLASH763 BIOSFILE.BIN /py
In the above example I am assuming that you are using the FLASH763.EXE flash utility. You will need to replace the FLASH763 with the name of whatever flash utility you are using and replace the BIOSFILE.BIN with the name of the bios file you are using. You will also need to change the \'/py\' to whatever command is for your flash utility to automatically program the bios without user intervention.
If you do not know the command to automatically flash your bios, type the name of the flash utility with a space and then /? to display the utility\'s help screen. The help screen should specify the command switch to automatically flash your bios. If you are using the FLASH763.EXE utility then the switch to automatically flash your bios is \'/py\'.
After you\'ve created the disk, put it in the floppy drive and reboot your system
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Solution 1: Boot-block BIOS
Modern motherboards have a boot-block BIOS. This is small area of the BIOS that doesn\'t get overwritten when you flash a BIOS. The boot-block BIOS only has support for the floppy drive. If you have a PCI video card you won\'t see anything on the screen because the boot-block BIOS only supports an ISA videocard.
Award: The boot-block BIOS will execute an AUTOEXEC.BAT file on a bootable diskette. Copy an Award flasher & the correct BIOS *.bin file on the floppy and execute it automaticly by putting awdflash *.bin in the AUTOEXEC.BAT file.
AMI: The AMI boot-block BIOS will look for a AMIBOOT.ROM file on a diskette. Copy and rename the correct BIOS file on the floppy and power up the PC. The floppy doesn\'t need to be bootable. You will see the PC read the floppy, after about 4 minutes you will hear 4 beeps, this means the transfer is done. Reboot the PC and modify the CMOS for your configuration.
Solution 2: Get a new BIOS chip
Contact your motherboard manufacturer to see if they sell BIOS chips. Some motherboard manufacturers send them for free.
Contact a company that sells pre-flashed chips, like Unicore Software, FlashBIOS.ORG or BadFlash
Solution 3: Hot-swapping
Note: I\'m not responsible for any damage this method may do to you or your computer !
Replace the corrupt chip by a working one. The best option is to take the working BIOS chip from a motherboard which has the same chipset although that\'s not absolutely necessary. It just has to give you a chance of booting into DOS. Before pulling the working BIOS chip out of it\'s original motherboard, set the System BIOS cacheable option in the BIOS to enabled.
After you have put the working BIOS in the motherboard with the corrupt BIOS boot the system to DOS (with a floppy or HD).
Now replace (while the computer is powered on) the working BIOS chip with the corrupt one.
Flash an appropriate BIOS to the corrupt BIOS and reboot.
Note: Use a flasher from MRBIOS. They are known to work best. You can find them at
ftp://ftp.mrbios.comSolution 3: (for Intel motherboards)
Change Flash Recovery jumper to the recovery mode position (not all products have this feature)
Install the bootable upgrade diskette into drive A:
Reboot the system
Because of the small amount of code available in the non-erasable boot block area, no video is available to direct the procedure. The procedure can be monitored by listening to the speaker and looking at the floppy drive LED. When the system beeps and the floppy drive LED is lit, the system is copying the recovery code into the FLASH device. As soon as the drive LED goes off, the recovery is complete.
Turn the system off
Change the Flash Recovery jumper back to the default position
Leave the upgrade floppy in drive A: and turn the system on
Continue with the original upgrade
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