Sony VGN-U750P VAIO Read This First Manual page 29

5 If the space bar key falls off, remove the wire (1) from the key top, attach it to the hooks (2) on the key unit, align the centre of the
key top, and then press it from above until it clicks.
If any key top other than the space bar key falls off, place it back into position and push it in from above until it clicks.
!
Do not take off the key top intentionally, as it may cause a malfunction.
!
Do not push the key top excessively when you replace it, as it may cause a malfunction.
Handle the key tops with care.
Troubleshooting sound
My speakers are not producing sound
❑ The built-in speakers may be turned off. Press <Fn>+<F2> to turn on the speakers.
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Using your VAIO computer