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When a computer starts up it runs Power On Self Tests (POST). When it finds a problem and can not continue it beeps out a code of long and/or short beeps. Run a web search for beep error code or POST beep errors. Most likly issues are memory or a video card that is not fully seated / making contact.
Unplug the printer. Generally, a UPS is to let you safely save your open files or documents and safely shut down. It is not really meant to keep everything such as printers and other items running.
If it is a laser printer, that is the problem.
If you have an older CRT monitor, that uses a large portion of the battery power capacity.