pc problems

I just got my computer upgraded and I can finally play good games. I plugged my monitor in and nothing. The power led Is on as an Orange light but the scrern is blank. I've had the monitor since 2005. Is it possible that its too old to be compatible with my now high end pc? Or what should I do to fix my problem and start testing out my pc?

your current pc resolution might not be supported by your new computer (ex. 1280X1024 which is 4:3 on a 16:9 widescreen monitor)

try changing your resolution and see if that helps