So i was seeing what type of ram my computer had, and i took it out, had a look, and replaced it.
I turned it back on and BEEP BEEP noises from everywhere!
I then smelt it and it smelt burning.
Then today I opened it up and had a look, the fans are both working, but it may be getting hot at a central point (I haven't found it yet)
Here's a video of the sound.

http://youtube.com/watch?v=D74PK0q01D4

Can somebody please help, I just bought $250 worth of wireless networking gear and then this happens.

Specs:
40GB HDD
A-open ATX-250 Gt PSU
Geforce 2 Mx turbo (maybe...)
512 SDRAM