All monitors have various resolutions that they will run at.
Higher definition monitors will have more resolutions available (although you'll want to run it at the highest (native) resolution for the best expierience.
If you run a monitor at an unsupported resolution for any period of time it will break; although getting it onto an unsupported red is near impossible these days.
Generic PnP monitor is correct.
Your Dell's screen is probably bigger and higher res thus having more resolutions available.
As you are new to the forum I thought you might like to know how to mark threads as solved as well as the uses of some of the other buttons.
To the top right of this post you will see 3 icons. An orange (+), a set of scales and a red and white warning triangle.
The orange (+) or blue (-) denotes whether a user is on or offline (orange = on, blue = off).
The scales are used to give rep points; click this button if someone has helped you significantly or solved your queries (only give this to posts that you think really deserve it).
The red and white warning triangle is used to denote either an abusive post OR to mark a thread as solved (just put solved in the box that comes up and the admins or moderators will mark it solved).
If you have any more questions please ask.
Oli