touchscreen 300 Screen does not stay on

I first got a blue screen and took it to a shop and they mention the ram because after they had it the screen went blank and couldn't get it to show the screen anymore. Turning off and on the power (power is on) the screen remained blank.

I replaced the ram and I got the screen and everything worked. After about 10 minutes the screen went to sleep, but I couldn't get it back on at all. I took the ram out and put it back in and it went on to slowly go off again within a few minutes. I went back in and removed and replaced the ram and it worked each time for a few minutes. What should I do next.

Sue

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