Vista monitor problems

[rogersah]

Took my PC (Lenovo w/ Vista) to Staples for a tuneup. When it came back it would no longer work with the old monitor. When connected to
my new monitor, all seemed okay. Any ideas on this? Video driver? Monitor setting?

 

[Gandalf]

I don't understand why you would want to use an older monitor, if the newer one works. If you must use the older monitor, take it back to Staples and ask them to fix it under warranty.