When I plug in an external monitor, I lose sound

The speakers don't work on the laptop when I plug in an external monitor. When I run a check, it says they are working properly.

Tomandiris, welcome to the forum.
When requesting help, you should always include the make/model of the computer and/or monitor. This information is necessary for us to review the specifications of the them.
It may be that the laptop is expecting to find external speakers. Since I am new to laptops, I will check further when I know the model.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
++++++++++++++++++
**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
I am not an HP employee.

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Hi bbcoffey,
Thanks for visiting Apple Support Communities.
If the issue with your display not waking occurs in the future, I recommend trying these troubleshooting steps:
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http://support.apple.com/kb/ht1573
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Hello vijay.nekkanti,
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http://support.apple.com/kb/HT3964
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--The driver software for this is up to date.
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Scott,
Many thanks for your answer! If you're right, what do you suggest that I do whenever I have to connect an external beamer/projector?
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Hans

When I plug in an external monitor, I lose sound

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