Hearing quick repeated noises & cursor behaving strangely

This has happened twice in the past 2 weeks.
The cursor on the screen starts flashing and behaving oddly (jerking around on the screen and not going where I move it to) and I am unable to click on things or I don't get the expected results when I do click the mouse.
It feels like virus or something. Eventually, I had to turn off the computer using the power button.
On start-up, I hear a series of rapid sounds, which sounds like when you press the wrong key on a keyboard or you choose something that the computer considers invalid. I was unable to login and the login screen was suggesting my password (i.e., a**********m), which seems to suggest that it thinks I have entered a bunch of characters for the password but which isn't the password.
From my amateur observation, it looked like a keyboard problem. I would press escape and escape and try to enter the password slowly, one letter at a time but I could see on the login screen that more than one letter was being entered somehow.
I checked my keyboard settings and made some changes to the Key Repeat & Delay Until Repeat rates and this seemed to clear the problem.
But today, the same problem happened and last night, I was unable to get the computer to go to sleep or to log out of my user account.
It does go to sleep and I hear everything powered down, but then 2-3 seconds later the computer starts up again as if I had touched the keyboard or mouse (which I hadn't). So I had to fully shut down.
Upon starting up this morning, the same rapid beeping sound was heard. But the sound stopped by itself.
My cursor though is working fine and as per this question, I am able to type OK from the keyboard.
I've checked other questions on this subject but I can't make sense of the replies or apply it to my problem.

The rapid repeating sound is audible at start up and if I press the escape button the sound stops. It happens every time I start after having shut down (which I have to do now).
I ran Disk Utility and fixed the Permissions (I don't know why the Permissions keep going out of kilter?).
One line said however:
Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent” has been modified and will not be repaired.
What is this and do I need to be concerned about it?
I still have the results of disk Permissions scan so I can copy & paste that info if it will prove helpful.

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Hearing quick repeated noises & cursor behaving strangely

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