I've no idea what I've done, but my computer isn't working. 
I press the power button, fans spin, but nothing else.
I removed a hard disk, and a few useless gadgets (cold cathode) from the power cables.
Also, when checking jumpers, I found out that the CMOS jumper was on "reset", but it has always been there, and the machine was fine!

I press the power button, fans spin, but nothing else.

I removed a hard disk, and a few useless gadgets (cold cathode) from the power cables.
Also, when checking jumpers, I found out that the CMOS jumper was on "reset", but it has always been there, and the machine was fine!