inspiron 5491 - erro cmos.

Maquina apresenta erro de cmos, (3,1.tabela abaixo). bateria substituída, porém  o desktop continua com o mesmo erro e não inicia a Bios.

Light pattern Problem description
2,1 System board failure
2,3 No memory/RAM detected
2,4 Memory or RAM failure
2,5 Invalid memory installed
2,7 Display failure
3,1 CMOS battery failure
3,3 BIOS recovery image not found
3,4 BIOS recovery image found but invalid
3,5 Power rail failure
3,6 Flash corruption detected by SBIOS
3,7 Timeout waiting on ME to reply to HECI message
The computer may emit a series of beeps during start-up if the errors or problems cannot be displayed. The repetitive beep codes help the
user troubleshoot problems with the computer.