OpenGL: VBO and a broken Graphics Card

I have recently tried the use of VBO. I just copy pasted the code from this site(This site prevents me from posting a URL)

It compiles fine and seems running well. However, I noticed on the taskmanager that the program runs at 50% CPU usage. Its just a simple triangle, nothing else. I was expecting it to be of 0% because all of other programs I created in glfw3 runs on 0% when idle. I know that V-SYNC in glfw3 is set true by default, but still I add this line of code to ensure

glfwSetInterval(GL_TRUE); //sets V-SYNC on

but still nothings changed.

After messing with the `test_vs.glsl` (I think this has nothing to do with the problem):

code I changed:

from

#version 400

in vec3 vp;

void main ()
{

gl_Position = vec4 (vp, 1.0);

}

to

#version 400

in vec2 vp;

void main()
{
    gl_Position = vec4 (vp, 0, 1.0);
}

And changed attributes of vertex in .cpp code to 2D.

Running several times the `Hello Triangle` program again, computer stops and hang a bit ---> Then**CRAASSH**. The graphics card is broken! (literally ouch). The computer shutdowns itself, and I try rebooting it again, I got a screen with full of random lines displaying and fail to continue on desktop.

I don't have much of the information about the graphics card but glew saysGeForce 7300 GT/PCI/SSE2/3DNOW! and running on Windows XP withOpenGL v2.1 support according to glew.

Some of the extensions I added:

glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_OPENGL_CORE_PROFILE, 2);
glewExperimental = GL_TRUE;
//And I add the prefix ARB to any function related to vbo

I suspect this is due to lack of OpenGL extensions support check. But, is that so really the problem? Is it the simple program or other? If so, why would they let this to happen?