Hello all-

My apologies if this is not in the correct forum...

 

I'm attempting to diagnose an issue with my mothers laptop, a Dell Vostro 1015. I've completed a thourough diagnostic test using dell software, no issues were detected.

 

Symptoms:

Pc screen suddenly goes black (generally when typing, but not always), and stays black unless I press the power button. After pressing the power button the black screen turns into user password login screen. After entering the password, and logging in, I am immediatley brought back to my last task, web page, etc..

Also, when logged into guest acccount, symptoms occurr more frequently,  but when logged intt Admin account this issue has occured just 2 times. 

 

Any advice, tips or ideas would be truly appreciated.