Windows XP SP3 Is Dead

Hello,
For some reason, when I turned my computer on. It displayed some blue screen with "Your computer has some problem, it will now shut down to prevent damage" (~~Something like that). I ignored it and turned off my computer, and then turned it back on... but....:

After that, the graphics went weird. Then the second restart, it displayed only black and made a long beeping sound.... pause for a second, then beeped again. It happens every time!

It worked last night when I went on the computer, we have 2 so that's how I am able to post this. I can't access anything.... maybe it is the graphics card.... I don't knows. I'm not a real computer expert either.