The PC will not be able to be turned on. When the computer doesn't start even with a start up diskette, the only solution is to replace the BIOS chip on the motherboard and there is the big problem. Many of the computers have soldered Bios ships that generally cann't be replaced. This means that the motherboard have to be replaced. On the payload the virus will reportedly overwrite certain flash Bios chipsets on some PC's.
Some computers have a jumper on the motherboard wich acts as hardware write protection.
Some PC's also have a DIP switch which allows the flashing Bios to be disabled. Some newer computers that cann't be protected by the switch and therefore are very vulnerable to the virus. I nput O utput S ystem. This is a part of your computer that initializes and manages the relationships and date flow between the system devices, including the hard drive, serial and parallel ports and the keyboard. Other files to read CompuDirect Press Release W32.CIH.Spacefiller and a quote from McAfee's site.