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The green led light on the motherboard mean the board has stand- by power to it. (This is normal). You stated you installed a new CPU. The high pitch you heard could mean you did not add thermal grease or thermal tap between the processor & the heat-sink assembly. (A must have product). When you press the power on button on the case & nothing seems to run, Re check your memory & as Smithbrother suggested insert one stick of memory at a time & try powering up the system. If you have an AGP card already installed, re-move it & re-seat it. Intel list a bios update. This update is for - B-0014. Fixed the issue with booting using 2.0Ghz processor. Your new CPU of 1.7 is close. (Not sure if this will fix your problem. Save flashing the bios as a last ditch effort). Here is the Intel link for your motherboard; http://downloadcenter.intel.com/filter_results.aspx?strTypes=all&ProductID=823&OSFullName=Windows*+XP+Home+Edition&lang=eng&strOSs=45&submit=Go%21
Just in case I'll include a YouTube video on how to install a CPU; http://www.youtube.com/watch?v=FyK-roVdx7c
You can test the power button. Remove the wires from the power on pins on the motherboard. Momentarily jump the two pins with a small screwdriver. If the computer starts the power button is bad. If it still doesn't start then something else is wrong. Did you test the memory? Also do all of the fans work, especially the CPU fan? It can't hurt to test with the other PSU. You know the HDD is good. Test one piece of hardware at a time and hopefully you will find the problem.
If you get one continuous beep (Long and Non-Stop)
This could happen if:
1. The Power supply is damaged or bad.
2. The BIOS is corrupted. Try resetting the CMOS using JCMOS1 jumper on the motherboard or remove the battery from the motherboard for 20 minutes. At this point the first thing to try is a different Power Supply to see if the result is better. If the same problem happens with the new power supply, you may need to send the BIOS Chip to local dealer for reprogramming.
If you get one long High Pitched tone that does not stop until you disconnect the power supply:
1. Check if the CPU fan is connected to the JCFAN1 connector.
2. The CPU might be overheated. Change the CPU FAN or check if the CPU fan has proper contact with the CPU. Refer to your manual for CPU installation.
3. Clear CMOS battery (JCMOS1), be sure to set JCMOS1 back to 1-2 position. (See Quick start guide/ user manual for more info on how to clear the CMOS)
4. Make sure the power supply you have on your system supports the M/B specification. Example. If you have a P4 M/B, you need to use an ATX v2.03 specification power supply. (power supply that has an extra 4-pin square connector)
Can think of only three possibilities: 1. CPU fan motor, bearings needs lubrication or replacement; 2. Power Supply fan motor, same as above or any of the other fans; 3. Hard disk spindle motor (though unlikely).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Hi. Continues short beeps... means a short OR no power OR loose card OR system board. Test it without the keyboard and mouse too. Just the Processor with heatsink, motherboard, memory and Video card. Now add the keyboard, no mouse yet. Check also the voltage of the CMOS Battery it should be 3V.
keep me posted for the result... count also the beeps.