My PC won’t turn on

Hi. My PC is about 2.5 years old and has been working perfectly the whole time. This morning when I went to turn it on I saw no lights or fans spinning. I tried disconnecting it and waiting for half an hour as well as holding down the on button for 15-30 seconds. I took out my power supply and verified that it works using the paper clip method. My next thoughts are that perhaps the motherboard is broken??

My specs are as follows:
Intel core i5 6500
MSI B150M Bazooka Motherboard
MSI GeForce GTX 970 OC 4GB
Corsair Vengeance DDR4 2x4gb RAM
250 Gb Samsung ssd
2TB seagate barracuda
Be Quiet! 600W power supply
Windows 10

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Make it smaller

Psu + Mobo + cpu/hsf.......nothing else connected or plugged in.

If it will not power up your down to 3 parts.

Remove the mobo from the case and put it on a piece of card board.....does it power up?

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I used a paperclip to trip the power switch pins on the motherboard, and the pc turned on! Does this mean it was just my power button on my case that was broken the whole time?

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Could be

Use an ohm meter on the switch to see what it's doing.

Now that you have it powered on does the machine run?

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