Monitor displays's "going into power saving mode" then blacks out.

[Bionicllama]

Ok, so I just built my new (and first) gaming PC. When I was finished and made sure everything was connected, my Dell monitor flashed "going into power saving mode" and went black. All the fans in my computer were spinning and all the LED's were on. My mouse's LED's were also on when connected to the USB port. I've made sure everything was connected and troubleshooted all last night, but to no avail. I've tried booting it with one stick of RAM, booting it up without the graphics card, and even took the computer apart and put it back together again. I'm completely stuck on what to do.

Specs:
HDD - Seagate 500GB Desktop HDD SATA 6Gb/s 16MB Cache 3.5-Inch Internal Bare Drive

Motherboard - Gigabyte AMD FM2+/FM2 A88X Dual-Link DVI D-Sub Triple Monitor ATX Motherboard GA-F2A88X-D3H

Monitor - Dell D2015H 19.5-Inch Screen LED-Lit Monitor

Case - Sentey Gs-6008 Stealth Gaming Computer Case - 1 USB 3.0 + 1 USB 2.0 & Hd Audio and MIC - 120mm Front Blue LED Fan and a Rear 80mm Black Fan - 2.5" SSD

CPU - AMD Athlon Multi Core Processor AD760KWOHLBOX, 760K Richland 3.8GHz Socket FM2 100W

Memory - Crucial Ballistix Sport 8GB Kit (4GBx2) DDR3 1600 (PC3-12800) 240-Pin UDIMM Memory BLS2KIT4G3D1609DS1S00/BLS2CP4G3D1609DS1S00

Power Supply - EVGA ATX12V/EPS12V 400 Power Supply 100-N1-0400-L1


UPDATE: I should also mention that I have hooked up the monitor to my laptop and it worked fine, so I know the monitor is not at fault.

Graphics Card - Asus AMD Radeon R7 260X OC 2GB GDDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card (R7260X-OC-2GD5)

 

[ffg7]

disconnect all cables to drives, remove all cards & ram except for 1 stick, clear the cmos as found that to work sometimes to kickstart a stubborn system.

 

[Bionicllama]

disconnect all cables to drives, remove all cards & ram except for 1 stick, clear the cmos as found that to work sometimes to kickstart a stubborn system.

I've done all of the above and still the same result. Whenever I try and wake the computer up it gives the message, "There is no signal coming from your computer. Press any key on the keyboard or move the mouse to wake it up."

 

[Bionicllama]

So, are there no other solutions then?