System Halted

--- I wonder if you guys have got or what is this error: System Halted

This message appears after the POST and locks the whole machine, when I entered the setup and leaves the machine is working again, only for 2 days ...
not know what is happening ... If alg know anything about this lock, please answer me!
The machine configuration is: P4 2 GB
The
D850MV Intel MB - 512 MB Bios updated
Rambus PC-800
Pl Video Sis
32 MB HD 40 GB Quantum Plus AS
Internal ZIP 100 MB [/ list] ---

already thought q may be the battery ---

've Watched this once in a message board for pentium mmx and memory was faulty ... try to test them on another PC, or see if they are not poor contact with ...