Desktop display temporary no signal screen

[chadmanning222]

ok so i have a desktop display(chuntex) for my win xp computer but then i upgraded it to win 7 ultimate now every time i switch users or log off it will say no signal but if i shake my mouse around for awhile it will come back on and work fine (but slow but i think thats cuase my hard drive is really full) this is becoming quite annoying now and was wondering if there was anyway to fix?

 

[tank]

What are your comp specs, including how much free and used space of the hard drives.

 

[chadmanning222]

What are your comp specs, including how much free and used space of the hard drives.

well judging by my cpu gadget im using most of my RAM and core1 whatever that is and cpu is around 100%

 

[tank]

Do you have more than one core?

It could be a simple issue of not enough RAM.