I have been using Xubuntu 14.04 alongside Windows XP. Today all of a sudden while surfing the Internet the screen started flickering. I restarted the computer, it ran successfully but the same issue came up. This time there where continuous beep sounds from the CPU. Please help.
Specs:
Intel Pentium D 3.00GHz 2GB RAM Gigabyte G41-M Combo Xubuntu 14.04 LTS & Windows XP
Screenshot - https://i.stack.imgur.com/QCUvU.jpg