There is often a problem when you turn the power on and a green light is flashing or steady on the monitor, but your computer does not boot. And a system case and monitor are also connected by a cable and there is not any message “No Signal” on a screen.
This problem appears in two ways: there are some inscriptions on a screen but operating system does not boot; or the screen is dark and something beeps or flashes in a system unit.
The first problem is rather simple – probably, BIOS could not find any boot records on those devices that are listed in its parameters. For example, there is a floppy in a drive containing general data – BIOS has detected a device that is ready for system booting and has transmitted a control to it, but there is no boot record on a floppy.
It is also possible that the parameters set in BIOS are inaccurate. For example, you have changed a hard disk but have not identified it in BIOS.
It may also happen that the power battery of BIOS has run out. This problem can also be solved. In this case all BIOS parameters automatically take default values and “CMOS battery failed” (or “CMOS battery state low”) may appear on a screen. Most default parameters in modern BIOS have the value “Auto” that enables automatically setting the most appropriate values and also determining the available IDE-devices. There is no automatic default determining of IDE-devices in outdated models of BIOS but you can also try to boot your computer by setting the value “Auto” for all Primary and Secondary Devices manually.