"fatal error system halted"

[sudhirnpc]

dear all i dont know whether i m in the right forum or not but since morning my PC is not starting and while booting shows a message as if it was not properly shut down (ask me to pressf4 ) obeying its command gives another message "enter current password" though there is no password in my PC. three consecutive attempts shows the message " fatal error system halted"
please help me out
thanks
sudhir
sudhirnpc<at>g m a il .c o m

[Sylvander]

My Guesses:

1. "ask me to press f4"
I think the BIOS's POST has detected an impending fatal error in the processing of commands, and cannot continue, so it wants you to go into the BIOS Setup and make a configuration change to eliminated the problem [a configuration setting causing the problem].

2. ""enter current password""
The present BIOS configuration settings require that a BIOS user password be entered before it will allow the user access to the BIOS Setup.
Was there previously no such BIOS configuration?
In which case that would suggests chaos is creeping in to the settings in the CMOS; probably because the CMOS battery needs replaced.
Remove the CMOS battery to make the BIOS revert to the default configurations, and see if those produce a fix.
If you subsequently need to make deviations from the defaults, you will need to fit a good CMOS battery, then make the configuration changes.

3. ""fatal error system halted""
No configuration change was made in the BIOS Setup and so the Fatal Error has taken place and the BIOS is reporting that fact.