HP TouchSmart 300-1205z CTO Desktop PC - Manual (Page 30)

24 User Guide (Features may vary by model)
To turn off the monitor from the keyboard:
Press the Fn key and simultaneously press the F9 key to turn off the monitor if you are leaving for some
time. The computer continues to run; this is a power-saving feature.
Press Fn + F9 again to turn the monitor on again.
Installing a Security Lock
A security lock (sold separately) enables you to secure your computer from theft and unwanted changes.
A security lock is a key lock device that has a wire cable attached. You attach one end of the cable to your
desk (or other stationary object) and the other to the security slot on the computer. Secure the security lock
with the key.