Today found a dell server fails, the machine can't normal boot, in front of the sign of a lightning has been flashing, as shown in figure



Check the related information, the sign shows yellow light may be power or problems such as voltage, change other normal power supply, the problem will appear;

Then open the case, and found that the red box in the green has been flashing, as the chart



Where is is a failure? Need to how to deal with?