I installed a new screen about a year ago and everything worked fine since then, until recently. At random times, my screen begins getting red pixels all over, then the screen goes to a (random) garbled color.
Cables loose connection, check with your technician
SOURCE: HOW TO CONNECT 5.1 WITH DELL STUDIO 15(1555)
Open up Control Panel and navigate to IDT Audio Control Panel.
On the right hand side, there would be an image depicting the jacks available on the 1555. Left click on the respective jacks and change them corresponding to the 5.1 outputs. 
SOURCE: my dell studio 1555 webcam stopped working
1. disable all streaming files and apps first.
2. run system restore, restore the point when webcam was working fine. if fails.
3. uninstall / reinstall webcam driver. if fails.
4.
SOURCE: my dell studio 1555 is slow in getting started.
if your computer's ram is low try upgrading it
/or maybe your computer is infected with virus try to have a full scan on your computer
/or you hard disk's free space is too low try deleting unwanted files.
SOURCE: Cd is stuck in my dell studio 1555 laptop?can you
Look closely at the bezel of the disk drive, you should see a small hole.
Straighten out a paper clip and push it, quite firmly into the hole. This is the failsafe release.
SOURCE: on screen display of dell ac power adapter not
2 possible causes, faulty adapter or faulty motherboard. try to update the BIOS if applicable. If this does not work, attempt to test the adapter on another laptop to confirm if it is working, or try a confirmed working adapter with your laptop. If same issue with another adapter, or if your adapter works with another laptop, it will be a motherboard problem. If the adapter fails on another laptop or if another adapter works with your laptop, you'll need to get a new adapter. Hope this sheds some light. Feel free to rate the usefulness of the information.
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