Any one using Cyberpower UPS's which have failed to the 4 beeps which the manual\nonly states to check with Cypberpower on possible repair via warranty.\n\nAny one determined what the condition is that causes the 4 beeps?\n\nBattery has gone bad?\nInternal Fuse? \n\nI have one of the Cyberpower 500SL that after working great for about 2 years,\nafter returning home from one of the numerous power outages I found it was dead,\nand would not reset. It just makes 4 beeps and the battery outlets are dead, no\nvoltage.\n\nCyberpower was, well, less than informative about what caused this problem.I\nfigure its either the battery needs replaced or there is an internal fuse that\nhas blown that needs replaced. As from the indications from Cyberpower its\nrepairable at a cost, so it doesn't seem to be a total loss. \n\nAny one diagnosed this situation and found an answer. I would like to repair\nthis unit and put back into service if its a simple battery change or internal\nfuse repair. The lack of a substantial answer from Cypberpower just to make a\nbuck on a repair annoys me.