Triple monitors not detecting computer when turning on pc sometimes

[TroubleShootMe]

Sometimes when turning on my pc my monitors say "There is no signal coming from the computer. Press any key to key on the keyboard or move the mouse to wake up. if there is no display, press the monitor button now to select the input source on the On-screen-display menu" and then it goes into power saving mode. I can temporarily fix this problem by turning my computer off then back on loads of times (Works only sometimes) or swapping the HDMI monitor with a spare monitor for it to boot then changing it back. The 3 monitors are connected to Displayport, HDMI and DVI on the graphics card (AMD RadeonHD 7770). Ive been having this problem for a couple of months and I would really appreciate some help, thanks.

 

[TroubleShootMe]

please can somebody help me, i would really appreciate it