When i click on youtube videos, the screen comes up but doesnt play it just stays black.

check if you have a 'trusted'media player on your computer and check for other random media players they might be messing with your system.
hope it helps:)

If you hit full screen on the youtube video and its not full screen, then it sounds like your monitor resolution is to low.

Rt click on a place on your screen and pick screen resolution, then pick resolution and increase it.

The first number is width, so say it's on 800x600 then go 1024x768

You may need to update your Adobe Flash Plugin. Use another browser to see if the problem occurs.

Step 1:

it could be one of 2 things. either its youtube or you.

Step 2:

YOUTUBE CHECK: go onto a video and scroll over the icon on the video that is next to the play button. scroll over it and you will see a tab that you can move for sound. if that doesnt work you can try this other way.

Step 3:

COMPUTER CHECK: first make sure you have some sort of a speaker for sound to come out of. ok. now, check to see if they are plugged in. if they are and are still not working go to the lower right hand corner of your computer screen click the tiny button that looks like a megaphone you can change the volume now. HOPE THIS HELPS!

Make sure your computer meets these requirements. Flash player installed would be the most important.
http://support.google.com/youtube/bin/answer.py?hl=en&answer=78358

unblock youtube.com

Hello lewis_a_1,
You will need to clear the cache (temporary internet files) in your browser! I had this happen earlier this week with YouTube.
If you need step-by-step help, please provide your browser and version!
If this was helpful, please give me thumbs up!

When this happened to me, I did the following. I have a Windows Vista Operating system. On my browser tool bar, I clicked on Tools, then Internet Options. On the Security tab, I clicked on Reset Defaults for all 4 zones (internet, intranet, allowed sites, and blocked.) I then had to reboot. I hope this helps.

Thank you for reaching out to FixYa.

You have to download video and audio codecs for that matter. Go to this link:

http://www.free-codecs.com/XP_Codec_Pack_download.htm

Download it. When a box appears, Click Run button. 

*Drop me a comment and i will assist you guys. Your vote will be appreciated. Thanks in advance. 

Best regards