K7N2 - System won't boot (CMOS clear does nothing)

Question

I was trying to OC with the help of a friend. AIDA32 showed my processor running at 2000MHz (7.5 x 267). I was told that putting CPU Ratio to 12.0 and FSB to 166 would get me no OC, but that this is how it should be (?). Since I was being careful (cause of past experiences), my friend told me to set it at 7.0 and 166. Just to be safe. Anyway, I made the change and after that when I press my power button, the computer turns on but nothing happens. No signal is sent to the monitor, neither does the floppydrive do its friendly sound like usual. I was told to use CMOS clear, so I changed the jumper into clear mode, waited a couple minutes and put it back. Nothing happens. I then tried changing some parts, put a 900MHz TB in, another GPU and even tried another monitor (desperate at this time!). Now, I was under the impression that CMOS clear should do the trick, that I was safe. But since this happened last night, I even left the jumper on clear over night. Still nothing happens. What am I to do? I would greatly appreciate any help, I am totally lost here.
My system: XP 2400+ (Thoroughbred-B), MSI K7N2 (nForce2), 2x256 Kingston Hyper-X, Sapphire Radeon 9800SE AiW, WinXP Pro. Thanks for any help in advance.
P.S. A similar thing happened before, which mysteriously got fixed by changing parts left and right. I also checked a post on the forum about the multipliers being weird in the BIOS (that's what my friend thought too).

Answer 1

your cpu uses 15 as a multiplier so you cannot select lower multipliers without the wire trick
and if its new evan that does not work
 Clear CMOS Guide
be sure to press start before moving the jumper to clear the psu