|ahuechteman has posted an answer to the question "Youtube is showing black screen, no sound or video":|
FIGURED IT OUT!!!
I found it on this site...
Follow these steps and it should fix most or all the problems...
1. close safari (afrter reading instructions)
2. open finder
4. right click on safari
5. click on "get info"
6. box appears and click on "open in 32-bit mode"
7. close box and reopen safari
8 youtube videos should work fine!!
Let me know! It worked for me and many others
View this question at the Google Help Forum
Your wife's HP probably does not have a Flash player version 10.2, the prior versions work fine. By the way, should be able to view youtube videos in the uploaders youtube channel page [windows or macs should play ]