Since you put both questions here I will assume they're related, if not please add more information, or ask separate questions.
Because, if you think they're related, then you've got a a worse problem than keyboard and mouse and sound. Especially since plugging in an external drive makes your speaker not work.
I'm going to say something messed up your motherboard. Sorry, that's the only thing they all have in common. :-(
SOURCE: double display with my IBM think pad T43
have you tried Function F7/F8 ?
Make sure that your display driver is installed correctly.
I had the same Laptop as you did and was able to have dual monitor.
Also check your Display driver in your control panel and make sure it set to dual monitor.
SOURCE: Keyboard, Touch mouse and all USB pads not working
first of all u have to re install windows( operating system)
before inserting the windows cd u have to plug an external keybord and mouse and start the system.
boot from cd and continue.
the laptop keybord and mouse could be unusable anymore.
SOURCE: hp pavilion dv1000 laptop pc keyboard not working properly.
Does this computer KB work alright in SAFE mode? If it does then drivers and/or viruses are the problem. If it doesn't work in SAFE mode then it could be drivers and or keyboard. Now try booting into BIOS. At the date prompt you usually can type any keyboard letter. If the keyboard works here, then you definately have driver/virus issues. If not replace the keyboard.
SOURCE: the shift doesn't work. with caps-lock i can
Kindly run Dell Diagnostics.
Boot to F12.
Select Dell Diagnostics.
Custom test for Keyboard.
If shift key failed you need to have your keyboard replaced.
SOURCE: I can't unmute my speakers.
It seems to me that the problem might be a driver issue. Try to restart it, if the problem remains, go to control panel, disable the driver, reboot again and return to control panel and enable the driver again. That might work.
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