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There are actually a few things that can cause this
1. VGA/DVI cable unplugged
2. Monitor input settings wrong ..
a. for instance you are using the VGA (Blue) plug and the monitor is not set to auto or analog.
b.or white plug (DVI) is plugged into monitor set to analog.
A few worse case scenarios;
bad video card on /in computer
bad RAM on motherboard ( i have seen this a jillion times)
and the worst case is motherboard is toast..
Play with it and let me know what one it was..good luck
I ahve to assume that your new monitor has a DVI connection that looks like this...
Your Optiplex probably has a VGA connection that look like this...
You'll need a VGA to DVI adapter (available at electronics stores or online everywhere.
Or, to take advantage of the higher quality resolution of your new monitor, you might consider buying and installing a new graphics card with a VGA & DVI adapter so you can plug it in directly and get higher res.
Contacted viewsonic about this issue- they suggested- have both dvi and vga hooked up to same machine. start with poweroff on both. power on monitor, then power on computer. when you see display coming from the vga, power off pc, then disconnect vga cable, turn off power to monitor, disconnect power cord from monitor for 5 + seconds, reconnect power cord, power on monitor, then power on pc.
If this doesn't work to get the dvi working, (as happened to us) we returned our monitor for a replacement, since it was still under warranty.