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Test the PSU. Unplug it from the motherboard and then with nothing connected, short the green wire to any ground (usually a black) using a paperclip and it should come on and stay on if the problem was with the motherboard/computer but if it shuts down, then you know the problem is the PSU itself.
If the PSU stays on under no load, then one possibility is you had too much connected to it and it shut down as a protective feature. The Bios would not beep if the PSU is shutting itself down. Also make sure you have the internal speaker connected. It's possible you just can't hear the beep because there is no speaker connected or it may be connected to the wrong place.
Don't throw away a defective power supply. It is worth a couple bucks as parts for an electronics enthusiast. Keep it out of the landfill.
You can actually test the power supply before connecting it to the motherboard. Take a look at the power supply pinout by CLICKING HERE. Jump pin 14 with 13, 15, 16, or 17 to turn it on. You will have to get a manual for your motherboard to see how the front panel connector is configured with your case power switch. If you have that manual you can jump the 2 connector pins for the power switch to test the p/s from the motherboard.
the smoke means that you have a short circuit somewhere on your laptop double check the connections that you have made you might have to replace the flat ribbon make sure there is no dust at these connections you have to keep a computer free of dust/causes static electricity otherwise it can cause it to overheat and many other problems hope this helps
Normally the front panel on/off power button and the front panel reset button plug into connector pins on your motherboard.
If you can find a User Manual for your motherboard it will show you exactly where the switch leads plug in on the motherboard. The motherboard's manufacturer and model number will be printed on the board somewhere.
You can use a paper clip and jump the connection from the green wire to a black wire next to it, this will force the power supply to turn on. If the PSU turns on, the means your issue probably lies elsewhere in the system, like a bad power switch or connection.