Cursor freeze up during start up

[gulabg]

I have an e-machines computer 1.17 geg hertz with windows xp operating system.
A few days ago the computer started showing blank screen on the monitor.
Some one suggested that I should install a separate graphics card and disable
the integrated intel graphics on the mother board.
With my limited knowledge I did install geforce 8400 gs card and disabled the
intel graphics adapter.

Now when I turn on the computer, I get emachines logo,then windows xp logo,
then it wants to check disk drive E and F, I do not know why, as it never did this
earlier, then I get a message that windows is starting up and then I get a "Welcome"
screen. During this screen the curser freezes up. Sometimes it does not freeze up
and the computer goes back to rebooting cycle again.

I do not know what I am doing wrong.

Please help.

Best regards,
Gulab

 

[gulabg]

Another development this morning. The computer does not even try to boot up. I hear no sound of
hard drive turning and no beep and no display.
Can it be a dead hard drive or something else? How do I boot up with a recovery disc, if
the computer does not even try to boot up?

Please help.

Best regard,
Gulab

 

[gulabg]

Today I changed the powersupply to see if it made a difference. I noticed that fan on power supply came on and fan on graphics card came on and also the yellow light on front panel came on to show that hard drive was running. The CPU started getting warmer, but fan for CPU never
came on. I still did not get any display. I also noticed that generally when I push the power
button, I get a green glow around the button to show that computer is on. I am not getting
that any more.

Can my power button be causing a problem? If so, is it possible to replace it?
Also is the fan for CPU supposed to come on at a particular temperature?

Best regards,
Gulab