Today, one of our IBM system3650X series server encountered an DASD error.
An orange Exclamation light turned ON and the server was not booting properly. This server have 2 HDD running in RAID mode. both HDD green lights were flashing properly which was showing that the HDD are in good condition. So I applied the Power Recycling solution and it worked like a charm 
.
Howto do Power Recycling / Cold Restart
# Shutdown the Server
# Remove Power cables (both) from power supply.
# Wait for 10 Minutes,
# Now plugin the power cables and turn ON the servers and you won’t see orange light
More information can be found here
http://www.google.com.pk/search?q=ibm+system+x3650+dasd+error&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Regard’s
Syed Jahanzaib
