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That power supply is probably dead. try your motherboard witha known-to-be-good power supply to determine if your system has survived. IN my experience the failrate for antec sp450 watt psu is close to 40% over 4 years (300 pc:s at university), so there is a high probability that your psu is unrecoverable.
there are several filter capacitors inside the power supply that are defective and /or are changing value. this accounts for the high pitch squeel you are hearing...the only REAL way to test for these problems are with an esr meter or lcr bridge, but you can physically look at the capacitors and see if any of them are bulged up or leaking., my suggestion is to go to tigerdirect.com and get another 450W or better PS...they are pretty cheap there
orange - +3.3
white - -5v
green - ps-on(+5v)
gray- power good(+5v)
purple- stand by (+5v)
disconnect smps from motherboard give the power to smps and short green and black wires and measure the above voltages
1. Check that the cpu fan is properly connected to the correct port marked CPU FAN.
2. Make sure the power cables are connected correctly to the motherboard.
3. Test the button switch with a multi-tester to make sure that it tests good.
4. Make sure the power switch is connected to the correct pins on the motherboard.
5. With the computer off pop the cr2032 battery out and pop it back in after a few minutes.
6. Test the power supply with either another motherboard or a power supply tester.
7. Test the motherboard with another power supply.
8. If all else fails replace the motherboard I have had a bad one from time to time even out of the box, and if you have a spare cpu you may want to test with that also. Cpu's hardly ever go bad I think I have had two go bad ever, not counting power surges and storm damage.
Actually, there is nothing you can do with the hard drive. If its shorting out the power supply when its pugged in then it is defective. However, most hard drives carry a 3 year warranty from the manufacture. If the drive is younger then 3 years old, I would call the manufacture and get it repaired or replace. Hope this helps . . .
That high pitched sound in one way is a very good thing. It pretty much points out the source of the problem itself. That is more than likely either a blown capacitor or transformer on the power source inside the monitor. I would rule out the power inverter for the LCD backlight because the power light will not turn on either. I have found that Samsung is very good with their repairs, and if it is a somewhat recent model they should be able to get it drop ship repaired with little expense. That can be an inconvenience, and if you do decide to replace the monitor altogether, please be eco-conscious and have the old screen either donated to a goodwill organization where scavengers like me will buy it for raw parts, or to an electronics recycling center. E-Waste is becoming a very large problem and LCDs and flat screens are a hefty piece of it.