PC not booting after ram upgrade

[Ryan_81]

So I found this HP Mini with only 1gb of ram. Which is unusable. So I decided to throw 1 4gb stick in there. As expected it didn't boot up and I got a black screen. I believe the computer did not even post. So I threw in a 2gb stick and nothing. It didn't post again. What am I doing wrong?? I have upgraded millions of laptops and this is the first time I have seen this.

 

[smorizio]

go to crucial web page use there memory advisior see if the unit can be upgraded. if it can it tell you the speed and size of the ram.