Sinclair QL User Manual page 11

The QL doesn't use television sound because it has its own internal loudspeaker. You can
turn the television volume down if you wish.
A coloured pattern will appear after you switch on or reset the computer, this is the QL
testing its memory. The pattern will disappear after a few seconds to be replaced by the
copyright screen.
If you cannot get a picture at all first check that your television can receive the normal
broadcast stations. If it can then try the computer with another television set.
If you get a fuzzy or indistinct picture check that you are tuned in correctly; it may be
possible to pick up the computers signal in more than one place in the tuning range. Also
check that the aerial lead is firmly plugged in, and that you are using the correct socket on
your television set (if it has more than one).
If you wish to use a monitor instead of a television set the connections will depend on
whether it is colour or monochrome details can be found in the Concepts section under the
heading Monitor. A monitor lead with a plug to fit the QL's RGB socket is available from
Sinclair Research. The order form is in the Information section of this guide.
The QL needs to know if you are using a monitor or a television set. Press:
F1 for a monitor
or
F2 for a television
Microdrive 1 will run briefly and the red Microdrive light will glow, the QL is looking for
programs to load and run ( this can be ignored for now). The computer will start up and
display its cursor a flashing coloured square, and the computer is now ready to accept
commands.
USING THE QL