How do I remove a virus from my MacBook Pro?

There are no viruses for Mac, but you may have installed Adware or Malware accidentally. It is near impossible to tell with no information, but you can try downloading and running MalwareBytes which may solve your issues, and certainly will not do any damage.

Cheers

Pete

You don't have a virus as such - there are none affecting Macs. Please describe in details the symptoms you have which make you think you have a virus; and are you really running Snow Leopard? - if not please update your signature.

Viruses for Mac do not exist. Could you please specify why do you think your mac has a virus? What are the symptoms of this virus? Users sometimes confuse adware with viruses.

If you see lot of pop ups in your web browser most likely you have installed the adware. Follow the instructions on this web page in order to manually remove adware from your mac: https://support.apple.com/en-us/HT203987

You may also find adware removal guide on this page http://www.thesafemac.com/arg-identification/

If you do not want to remove adware manually use this anti malware tool in order to scan and remove it: https://www.malwarebytes.org/antimalware/mac/?utm_source=blog&utm_medium=social

Try booting in Safe Mode

Pete

Chester Robertson wrote:

My MacBook Pro laptop recently just stopped booting up. So on September 15, 2015. I had it diagnosed at a Mac store and it passed the test on all issues with no problems.

It was restored and the OSX was reinstalled. Everything worked just fine - for two days. Now, in 5 different languages my screen prompt says:

You must restart your computer. Hold down the Power

button until it turns off, then press the Power button again.

So I did that. But when I turned it back on there was a circle with a line drawn through it in the middle of the screen, and nothing else.

Is this a virus? Has this happened to anybody else? I need help. Thanks...

That is a kernel panic, often caused by faulty or badly seated RAM.

What is a Kernel Panic?

https://support.apple.com/en-us/HT200553

and https://support.apple.com/en-us/TS3742

http://developer.apple.com/mac/library/technotes/tn2002/tn2063.html

More details here:

http://www.thexlab.com/faqs/kernelpanics.html

Useful articles on how to avoid and eliminate kernel panics here:

http://reviews.cnet.com/8301-13727_7-10344626-263.html?tag=mfiredir

http://www.macworld.com/article/2027201/how-to-troubleshoot-a-kernel-panic.html# tk.nl_mwhelp

Notwithstanding what you were told, the startup drive is failing, or there is some other internal hardware fault.

Back up all data on the drive immediately if you don't already have a current backup. There are ways to back up a computer that isn't fully functional—ask if you need guidance.

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.

Keeping your confidential data secure during hardware repair

Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.

*An SSD doesn't need to be zeroed.