"Entering power save mode" issue

I recently built a computer with the following parts:

MSI a78-e35m motherboard
8gb crucial ballistix sport ram
1tb western digital caviar blue HD
evga gtx 650
corsair cx 430m
athlon x4 750k

I put everything together, turned it on, and everything appeared to be working. the problem is with the monitor, it has a vga output and a vga to dvi adapter that plugs into my computer. everytime i attach the adapter to the vga cable the monitor turns on and says "entering power save mode. at that point it isnt even plugged into my computer so im thinking it cant be a problem with the computer i just built. the monitor is a dell S2007w. also my computer does not yet have an operating system because i cant install one with this problem happening.

If anyone can help out with this problem i would appreciate it, thanks