I was installing a new m/b and I had the jumpers set for "reset cmos memory". I powered down and placed the jumpers in the appropriate position and tried to power back up. Nothing happens. Did I just fry my cmos?

LOL...hmm. What you explained doesn't really help but anything could be a factor in this problem. First thing, CHECK YOUR CPU and its socket. Do you see any LED's light up? If you have a system speaker, then it should beep for certain errors. If you don't have one, check your ram, HD, or any connections. If you changed any jumper settings, bust out that motherboard book and put everything back in its place.

Last but not least, if nothing works, and you assume that your Flash BIOS is gone, then just replace the FLASH chip with one that is made for your motherboard. You can get replacement Flash chips with a preinstalled BIOS from the board manufacturer. You'd have to call them up. They generally cost from $5 to $40 depending on the board and who you're dealing with. In my opinion, just get an upgrade and buy yourself a top of the line motherboard with support for your current CPU. Or just get a new CPU!

If when you hit the power it starts powering up (for a split second.. CPU fan moves a couple rotations) but then shuts right back down then it's a CPU or motherboard error.. if you get nothing at all (not even a twitch), it could be the power supply

umm.. I don't think you can fry a CMOS. I've never heard of it before, not in modern computers, or it's very unlikely.
Do this.. take the battery out, unplug the comp (literally unplug), wait 30 seconds, and put everything back. Try starting it now. The CMOS might have been corrupted, this will reset it from the ROM image.
If this doesn't work (try it twice), and it does the exact same thing, the CMOS is definitely not a problem.

As fang said, does it do anything at all?
Smell the power supply (as funny as that sounds) if it smells like it's fried.. it just might be. Try replacing it, or try testing it with a [ohm, amp, volt] meter.

Oh yeah...one thing on the CMOS topic. yes, CMOS do become corrupt or wiped. You don't really fry them, you just corrupt them or erase them! There are certain VIRII that do that which renders your CPU useless untill you raplace the flash chip. Removing the battery will reset the settings but not return it to its original form.

Most likely, you just busted your power supply due to turning it off and on quickly. Easiest way to check that is to see if the fan gets like a shock of energy and barely moves a centimeter. Generally, if your power supply busted, its fan stops spining (depending on the wiring of the Power Supply).

If your cpu is fried in which case I have seen many times also, the CPU will sping but your system won't even turn the monitor on. If RAM is fried (happend to me spicifically) then the system will beep through the system speaker.

VIRII -> Is not a real word. The correct word is virus/viruses. It's a misspelled word, generally used by script kiddies, so they look 'cool'.
http://www.perl.com/language/misc/virus.html

I think there are a handful of viruses that do that, none for Linux though, and he said that he's instaling a new motherboard. ( I only remember one, Cernobyl, though Id on't think I spelled it right) Unless it came preloaded with the virus (.. yeah..) that isn't really possible.
If the power supply is bad, it could also not move at all, and the entire thing with frying the power suppy by repeately turning it off and on, is kind of antiquated. Today power supplies can take the shock rather easily. (have you seen the specs on them?)

CPU fried = beeping through the speaker too. That's why too specific to the motherboard. If your computer remains on, it's either the CPU/Mem/motherboard.

LOL...relax there Dictionary.com. Big deal that I use a "fake" word by your standards. Don't kill someone over it.

BTW...how do you propose that the system beeps out an error code if it doesn't have a CPU to process the error with. From experience with a friend's computer, when the CPU fried, the thing didn't even turn on the hard drive let alone make any sounds (AMD Athlon 2000+).

One more thing, I stick with my theory about the Power Supply frying from a sudden turn on. Are you willing to prove me wrong by turning your pc on and off 10 times really fast? If you don't post, then I'll know that I was right :P. lol (JK, no hard feelings)

I think I've built.. at least a few hunderd computers all in all, and repaired a lot more. The motherboard can make the speaker beep even when the CPU is fried. That's generally the best indication that it's fried.

Ok, Just did that to one of my older computers, and it's alive and well. I've had little kids do that to my computers before.

[oh.. btw, I was relaxed when I posted the virus thing :P]

By using the microprocessor that handles the PC speaker. Same as it does when the CPU is plugged in. On board hardware is handled on the other side of the bios, then passed via the bios to the processor. Think of the bios as the place where you can manage all the low level functions of the hardware, then send the data to the processor and operating system. When you make changes in the OS that affect the low level functions of the hardware, you send it back through the bios, to the hardware controllers. Of course there's more to it than this, but this is the jist of it. If anyone of these controllers goes bad and shorts to ground, it can disrupt power across the entire board, causing the system to do nothing. The more complicated the chip design, the more prone to failure, thus the reason fast Athalon processors fail more frequently than something simple like an i810 sound chip. (not knocking athalons, i use a couple of them myself, just an example of the
top end of chip design).

A new quality made power supply will have the power on/off circuitry isolated from the transformer , and will have a circuit breaker up front instead of a fuse. this means if you do fluck it all up by slamming it on and off, give it a second or two an it's back to normal. Of course the average made in Taiwan dell/gateway/sony/ibm/emachine/etc computer isn't going to use that type of P/S cause they need to save the three bucks on each machine, so take it FWIW.