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I saw your posting and would like to try and help.
I am going to need to ask some questions to start with and also have you do a test. These are both to understand what might be going on with this unit better:
What is the model of this unit?
When you state, "... it gets so far then goes to a blank screen with a small white line on the top left ..."; can you tell me how far along in booting up are you? (Have you seen anything on the screen? Do you see the Windows logo? Have you got to your desktop? etc.)
When did this issue start in regards XXXXX XXXXX frame?
Was all ok before this issue presented itself?
What was the last step you did before this issue started?
Was there any new software or hardware installed right before this issue started?
Had you installed any updates right before this issue started?
Now this test will NOT resolve the issue, but will provide info that I can use:
Restart or power up the system, if off, and just has soon as you see anything on the screen, start tapping rapidly, 4 or 5 times, the F8 key. Your going to think about just holding it down altogether, but this will cause an error, so please do not do so. Tap rapidly.
We are looking for a menu on the screen that says, "Windows Startup Menu". If you do make it there, then you will use the down arrow key and move down to "Safe Mode" and then tap Enter.
It will eventually get to asking a yes and no question about Safe Mode. Answer yes. Now you will go to your desktop, or if you usually have to log in, then it will ask you to do so.
Note also that not everything functions in this mode, and / or may look different. This is ok and normal.
Now simply please let me know that you made your way to this special mode's desktop ok.
(To get out of this special mode, shutdown and reboot, and it will go back to normal mode.)
Thank you for all the answers and for doing this test for me. I will advise more based on all this info.