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Re: power supply burn
If the supply was the previous problem, the motherboard may be destroyed as well. Try it with just the motherboard, PC speaker, processor/cooler and power supply. If there are beeps, then the motherboard is ok and it may be the memory.
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This can be a power supply problem or a motherboard problem. One or the other has probably gone bad and must be replaced, if this is what happened. Start by disconnecting all things from the motherboard except the CPU and memory. If the system starts, then you've ruled out the power supply, CPU, motherboard, and memory. If not, remove the memory and see if it tries to start. If so, then the problem is the memory. If not, then it's definitely the power supply, CPU, or motherboard.
I faced the same issue not long ago. I opted to try the cheaper route of replacing the power supply and hoping that that was the problem. Luckily, I got lucky and that was the issue.
What was strange was that the system would appear to turn-on just fine, but specific parts of the system would not function like the hard drives would not spin-up. After replacing the power supply, the system booted normally like nothing had happened.
If you have a multimeter, you might try measuring the voltage coming from each power connector coming from the power supply, but be careful while you do this.
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.
To see if power supply works unplug the psu from the motherboard and drives then plug the power cord into psu and wall the fan should come on letting you know that it works.
you can also get a multimeter and check each individual connector on the 20/24 pin connector to motherboard. check the psu docs for the correct voltages to each pin
If you smelled smoke then chances are that something may have gotten toasted. remove all expansion cards and try to turn on computer if nothing happens then the motherboard may have gotten toasted. Check the motherboard and expansion cards along with memory for shorts and burn spots.
Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.