Change the Battery with a new CSB HC 1221W or a Power Sonic PS-1251 Press the power button for 3 seconds and it should power on.
Posted on Apr 10, 2007
See Troubleshooting page at: http://h20000.www2.hp.com/bizsupport/TechSupport/SupportTaskIndex.jsp?lang=en&cc=us&prodTypeId=329290&prodSeriesId=331919&taskId=110
Posted on Jan 17, 2006
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Lo conecto a la AC y acciono el interruptor y no hace nada , el led del frente no enciende y revisé el fusible pero está bien . Necesito el esquema electrico de la misma
My ups model hju88501 Green Light Is blinking and doesnt come on
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