After installing HP Support Pack 8.30 on a DL380 G4 with Windows Server 2008 the fans is on full speed.
To resolve this try to do a CMOS reset by turning off the server and disconnect the power cables. Set jumper 6 on the system maintenance switch (right behind processor 2) to on mode. Start the server to enter maintenance mode. Turn off the server and disconnect the power cables. Set jumper 6 to off mode. Start the server.
system maintenance switch
If this doesn’t help try to disable cpqasm2 by editing HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cpqasm2\Start and set the value to 4.