Last night I was changing my BIOS settings around. I changed my clock multiplyer and it worked...for a while. IT booted but didn't like my settings, then I changed them and it didn't boot at all. My comp powers on, but I get no BIOS loading display and my monitor never kicks in. Just wondering if any one had some suggests as to what to try.

You have to make sure you are actually getting a display to view anything. - Do you have a monitor w/ self diagnostic ? - If the monitor is disconnected from the video card, do you get any display if you turn it on. - Have you reseated the video card, ram stick(s) - Have you tried to reset the CMOS via jumpers or CMOS battery. Tell us what you've done so far. Do not type anything in this space.

Sounds to me like you went too far with your overclocking & your CPU/RAM can't handle it. Reset the BIOS as suggested by Sabertooth & start from scratch. Run thru every single BIOS setting to correct them. You don't mention what motherboard or what RAM, but I'm guessing you have 168-pin SDR-SDRAM...either PC100 or PC133. And you didn't state which 1200 Athlon CPU either...12 x 100MHz or 9 x 133MHz? If you have PC133 RAM, your max FSB setting will be between 140-145MHz. Since your multiplier is apparently unlocked, try lowering it to 8.5x for starters & see if the FSB will run at 140MHz...then experiment from there. Remember that it may be necessary to increase the CPU voltage...default is 1.75v...1.85v is safe. Beyond that, be careful & make sure to monitor your temps Asus A7N8X-X 1800+ @ 8 x 210MHz 768MB PC3200 Asus A9550 128MB/128-bit Gamer Edition WinME/WinXP Pro

There has to be a way to reset the Bios (CMOS) on the board. It should be named something like CLRCMOS or so. It's either a jumper or just two nearby contacts you have to short with a screwdriver. THIS IS DON WITH A SHUT OFF COMPUTER1111 Otherwise you may remove the Mainboard battery for a couple of minutes to reset the Bios. NEVER TOUCH BOTH SIDES OF THAT BATTERY AT THE SAME TIME OR IT MIGHT BE EMPTY111 If you have the Athlon Thunderbird B with 12x100MHz I can say than my one worked without problems at 10x133MHz from the first day and still does. I got it up to 138MHz (stable) but with everything above 133MHz the results of all Benchmarks I tried have been below those with 133MHz so I just stayed there! The good thin about the Athlon Thunderbird B 1.2GHz is that the multipliers aren't locked so you can change them in the bios or by jumper on the board without problems. That was the main reason I bought that system 5 years ago (the 133MHz version wasn't out then)! The problem with everything above 133MHz is that your ram isn't meant to run above 133MHz. If you have CL2 Ram change it manually to CL3 and you maybe able to run a couple more MHz with the Ram!