https://community.extremenetworks.com/t5/faqs/s-series-s-ac-ps-dc-power-led-is-off/m-p/42708#M126 Article ID: 12460 <BR /> <BR /> <B>Products</B><BR /> S-Series<BR /> S-AC-PS <BR /> <BR /> <B>Changes</B><BR /> Installed an S-AC-PS non-POE power supply into an S-Series chassis. <BR /> <BR /> <B>Symptoms</B><BR /> The "AC OK" LED lights up, indicating that AC line voltage is sufficient.<BR /> The "DC OK" LED does not light, indicating that outgoing power is non-operational. <BR /> <BR /> <B>Cause</B><BR /> This condition will occur if the power supply is inserted upside down. <BR /> <BR /> <B>Solution</B><BR /> Check to ensure the power supply is properly oriented in its bay. <BR /> <BR /> For more information, please refer to the S-Series Chassis <A href="https://extranet.enterasys.com/downloads/Pages/S.aspx" target="_blank" rel="nofollow noreferrer noopener">Hardware Installation Guide</A>. Wed, 06 Nov 2013 20:41:00 GMT FAQ_User 2013-11-06T20:41:00Z https://community.extremenetworks.com/t5/faqs/s-series-s-ac-ps-dc-power-led-is-off/m-p/42708#M126 Article ID: 12460 <BR /> <BR /> <B>Products</B><BR /> S-Series<BR /> S-AC-PS <BR /> <BR /> <B>Changes</B><BR /> Installed an S-AC-PS non-POE power supply into an S-Series chassis. <BR /> <BR /> <B>Symptoms</B><BR /> The "AC OK" LED lights up, indicating that AC line voltage is sufficient.<BR /> The "DC OK" LED does not light, indicating that outgoing power is non-operational. <BR /> <BR /> <B>Cause</B><BR /> This condition will occur if the power supply is inserted upside down. <BR /> <BR /> <B>Solution</B><BR /> Check to ensure the power supply is properly oriented in its bay. <BR /> <BR /> For more information, please refer to the S-Series Chassis <A href="https://extranet.enterasys.com/downloads/Pages/S.aspx" target="_blank" rel="nofollow noreferrer noopener">Hardware Installation Guide</A>. Wed, 06 Nov 2013 20:41:00 GMT https://community.extremenetworks.com/t5/faqs/s-series-s-ac-ps-dc-power-led-is-off/m-p/42708#M126 FAQ_User 2013-11-06T20:41:00Z