No need to use all capital (upper case) letters. Doing so is considered the equivalent of shouting.
Does the following link show your UPS?
http://www.gecotech-sb.com/doc/koss/Sylion.pdf
Do you have the User Manual/Guide for the UPS?
I found the following generic manual on Koss's website:
http://www.ups-software-download.com/winpower/data/WinPower Manual.pdf
Explain: " AFTER PLUG ON MY COMPUTER SOCKET".
Do you mean that when the computer is plugged into the UPS that is when the blinking and beeping begins?
The User Guide should explain what those blinks and beeps indicate. E.g. dead or failed battery, home electrical problem, or simply misconnected....
Are you using any of the UPSs' monitoring software? Check the voltages and other details presented in the application.