Posted 23 May 2006 - 07:06 AM
CIH infected program executable files and caused damage to systems with a flash BIOS ROM by attempting to reprogram the flash BIOS ROM chip. There was no remedy, other than replacing the chip or having it “reflashed” by a hardware service agent. If the flash BIOS ROM wass permanently attached to the mother board, the entire motherboard had to be replaced.
Other BIOS viruses that affected 9x/NT based machines included:
W32.Kriz infected program executable files, modified the kernel32.dll file and threatened to damage the BIOS, preventing the machine form booting up properly.
Troj/Flashkill was repoprted to destroy the first megabyte of data on a hard disk and wipe out the contents of the BIOS chip.
W32.Magistr.24876@mm erased CMOS and the Flash BIOS.
W32.Mypics.Worm monitored the system clock and when it detected the year 2000, the worm would modify the system BIOS. On the next reboot attempt, the computer would usually display a message such as "CMOS Checksum Invalid" and prevent the computer from booting.
These types of virus's are rare and they do not actually infect the BIOS. Instead they erase the BIOS of flashable BIOS's resulting in a machine that will not boot properly. I am not aware of any that affect NT based machines such as Windows 2000 and above in this manner. It is possible that the CMOS battery went bad or the BIOS was corrupted. In that case a reflash of the firmware would be required. If that failed, then a motherboard replacement would probably be needed.
Could just be coincidence that you had two machines with similar problems.
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