What is going on with my screen?

[Deezel]

Hi guys

I have a 2012 Mac Pro with HD display and for some reason it sometimes just goes black and comes back on again. In sequence with this, the brightness adjuster pops up and zooms upto top. This happens everytime I plug the keyboard in and quite often, more often recently, everytime I turn it on...does anyone have any ideas how to solve this?

In addition, I hear a noise from the HDD when it does this

Please help

 

[gsahli]

This happens everytime I plug the keyboard in and quite often, more often recently, everytime I turn it on

Just curious - why unplug the keyboard?
The combination of occurances with hard drive sound makes me think the power supply is weak. Do you have a different keyboard to try? (troubleshoot whether the keyboard is really the problem)