Try clearing CMOS.
With the power cord disconnected, press the power button to drain the system of any
residual power.
CAUTION: When the computer is plugged in, the power supply always has voltage applied to
the system board even when the unit is turned off. Failure to disconnect the power cord can
result in damage to the system.
Static electricity can damage the electronic components of the computer or optional equipment.
Before beginning these procedures, ensure that you are discharged of static electricity by briefly
touching a grounded metal object. See the Safety & Regulatory Information guide for more
information.
3. Remove the access panel.
4. Locate the header and jumper labeled CLR_CMOS or CMOS
5. Remove the jumper from pins 2 and 3.
6. Place the jumper on pins 1 or 2.
7. Put the jumper back on pins 2 or 3.
8. Replace the access panel.
9. Reconnect the external equipment.
10. Plug in the computer and turn on power. Allow the operating system to start.
NOTE: You will receive POST error messages after clearing CMOS and rebooting advising you that
configuration changes have occurred. Use Computer Setup to reset any special system setups along