HP Compaq Presario,Presario 1700 Supplementary Manual page 112

Q. My display (monitor) is blank. What should I do?
A. Your Notebook might be in either Sleep (Standby) or
Hibernation mode. Try pressing any key to wake your Notebook
from Sleep (Standby) mode. If this does not correct the problem,
press the Power button once to resume from
Hibernation mode.
Q. There is no sound coming from my Notebook. What's wrong?
A. You can control the sound coming from your Notebook
speakers by double-clicking the Volume icon in the taskbar.
The Volume Control window is displayed:
Make sure the Mute all box is not checked in the Volume
Control Balance section.