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erratic movement(when cursor is disabled)

hello all,

I need some advice regarding my laptop Inspiron 15R 5520. Erratic movement appears after few minutes of reboot.
I read some of the suggestions from the community posts regarding virus, so I have done the following tests:

1- run window defender (passed)

2- system assist diagnostic test (passed)

3- disabled touchpad and disconnected USB mouse - problem still presists

4- Reinstalled and reformatted operating system. - problem still presists

5- window is up-to-date

Attached video is how the erratic moves (no.3 is disable).Please kindly assist me in solving this issue.
Your assistance is greatly appreciated. Thanks in advance

Thanks and kind regards,


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