Boot up, keys stuck can't figure out which.

I have a laptop that I have booting into linux, but it won't boot until I press enter at the Grub boot loader menu.  After it starts to boot, the screen often gets filled with [[[C^ over and over again.

It will go away if I press enter or a few buttons, but I can't figure out which button is stuck, or if it's something else.  Any ideas?
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Hardware diagnostic CD    UBCD
 i suggest the UBCD  to run some diags first - to be sure about the basics
go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, you need to use an ISO burning tool
if you don't have that software, install cdburnerXP :

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)                        ultimate boot cd             download page
Use a can of compressed air to blow out any debris from under the keys.

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Just a quick comment ... after you follow the steps outlined by nobus and rindi, if you feel the keyboard is faulty, most laptop keyboards are relatively inexpensive, and some are very easy to replace. I've replaced quite a few over the years.
metazendAuthor Commented:
Sorry for the late close on this question, but I wanted to make sure it was just something that got stuck, other than a software issue.

Problem hasn't appeared again.  What I did was use the air-can method, and I did tap the laptop on the other side of the keyboard while it was off.  Not sure why it happened in the first place, but I thought it could have been software related until it started working again without change to the OS.

Thank you.
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