IBM Tripp Lite Internet Office 500 (09N3854) UPS System "battery red slash" Questions

Make sure the AC sign wave is lit solid not blinking, the battery should not be lit as well. If the battery is yellow, that means you are running on battery, if it is red that means the battery is low

red circle with a slash by it? If so, double click on the speaker icon and un-check the mute box. While you have the volume control open, make sure the volume controls are in the middle and not turned