I can't quit Safari and my screen has occasional jitters. What's wrong?

My MacBook Pro has developed several symptoms which I am going to guess stem from Mother Board problems.
1 My screen over the last couple of days has spontaneously jittered (not flashed) then the computer crashed. I could move the cursor but nothing else. I had to force a restart.
2 I tried to shut down but now I can't quit Safari.
3 I have 10 dark plumes coming out of the bottom of my screen evenly spaced.
Mother board failure or something else? What would be the best course of action? I am going to force quit again and see if I can get rid of the plumes.

Thank you Andrew. That solved my dark plumes problem. I finally got hold of my son who is very good at computer problems and he suggested that I shut down, remove my battery and disconnect the power supply. Leave it like that for 20 mins or more. Apparently the condensers sometimes get overcharged and cause strange little problems and that can fix them.
I have tried that and so far it is working like it did when it was new. I will work with it for a few days and report back.
It does seem like the dark plumes was a separate issue which you solved.
Thank again

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Helpful Links Regarding Malware Problems
If you are having an immediate problem with ads popping up see The Safe Mac » Adware Removal Guide, AdwareMedic, or Remove unwanted adware that displays pop-up ads and graphics on your Mac - Apple Support.
Open Safari, select Preferences from the Safari menu. Click on Extensions icon in the toolbar. Disable all Extensions. If this stops your problem, then re-enable them one by one until the problem returns. Now remove that extension as it is causing the problem.
The following comes from user stevejobsfan0123. I have made minor changes to adapt to this presentation.
Fix Some Browser Pop-ups That Take Over Safari.
Common pop-ups include a message saying the government has seized your computer and you must pay to have it released (often called "Moneypak"), or a phony message saying that your computer has been infected, and you need to call a tech support number (sometimes claiming to be Apple) to get it resolved. First, understand that these pop-ups are not caused by a virus and your computer has not been affected. This "hijack" is limited to your web browser. Also understand that these messages are scams, so do not pay any money, call the listed number, or provide any personal information. This article will outline the solution to dismiss the pop-up.
Quit Safari
Usually, these pop-ups will not go away by either clicking "OK" or "Cancel." Furthermore, several menus in the menu bar may become disabled and show in gray, including the option to quit Safari. You will likely have to force quit Safari. To do this, press Command + option + esc, select Safari, and press Force Quit.
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This will not work in all cases. The shift key must be held at the right time, and in some cases, even if done correctly, the window reappears. In these circumstances, after force quitting Safari, turn off Wi-Fi or disconnect Ethernet, depending on how you connect to the Internet. Then relaunch Safari normally. It will try to reload the malicious webpage, but without a connection, it won't be able to. Navigate away from that page by entering a different URL, i.e. www.apple.com, and trying to load it. Now you can reconnect to the Internet, and the page you entered will appear rather than the malicious one.
An excellent link to read is Tom Reed's Mac Malware Guide.
Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.
See these Apple articles:
Mac OS X Snow Leopard and malware detection
OS X Lion- Protect your Mac from malware
OS X Mountain Lion- Protect your Mac from malware
OS X Mavericks- Protect your Mac from malware
About file quarantine in OS X
If you require anti-virus protection Thomas Reed recommends using ClamXAV. (Thank you to Thomas Reed for this recommendation.)
From user Joe Bailey comes this equally useful advice:
The facts are:
1. There is no anti-malware software that can detect 100% of the malware out there.
2. There is no anti-malware that can detect everything targeting the Mac.
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4. Internet popups saying the FBI, NSA, Microsoft, your ISP has detected malware on
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5. Some of the anti-malware products on the market are worse than the malware
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6. Be cautious where you go on the internet.
7. Only download anything from sites you know are safe.
8. Avoid links you receive in email, always be suspicious even if you get something
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9. If there is any question in your mind, then assume it is malware.

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