So, you'd need to call Toshiba unless someone can find the exact beep code list for this model (i failed to find it). But it looks like either it's a RAM or Keyboard issue.
http://www.techspot.com/vb/topic95391.html
Try reseating the memory, and if you have more than 1 stick, remove 1 try it, then try the other one, 1 at a time. If that doesn't work, try removing your keyboard and reseating the cable.
User guide is here, hope it helps. You may have to take this somewhere.
http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=SB&os=&category=&moid=1042101&rpn=PSM50U&modelFilter=M55-S135&selCategory=2756709&selFamily=1073768663
In most cases this means bad memory stick. If you are able to, flip over the laptop, find the panel that has the memory under it, unscrew the screw(s) to get the panel off, and pull out the top stick of memory. Flip the laptop back over and power it on. If it works fine again, then that stick was the problem, and you can go buy a replacement and install it back into that slot. If that doesn't fix the issue, turn it off, flip it over, pull the other stick of memory out and put the first stick into that slot. Flip it back upright and turn on again. If that fixes the issue, then the second stick of memory is bad and you can just replace it as well. If neither of those fix the issue please reply on here and we can do further diagnostics.
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