Question

New PC not posting

Just finished building a new PC.
I5-9600k
MSI Z390-A Pro
1070
Corsair 550W
Cooler Master 240 Lite
Corsair Spec Delta Case
16GB Crucial 2400MHz (Wanting to upgrade soon anyway)

All wires seem to be plugged in according to my knowledge. I am seeing the power button LED turned on, but when I press it nothing happens. The EZ debug light does not come on, no fans spin and nothing seems to happen.
I have tried resetting CMOS through both disconnecting battery for a prolonged period of time and jumping the reset prongs, launching with one stick of RAM in all slots, without GPU installed, shorting the power button using a screwdriver, with and without drives connected.

I am totally lost and I would appreciate any help, my line of thinking is that the board is dead but it was working fine when I tested it a few days prior so unsure.

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Comments
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Answer
Some parts look optional at first.

The 1070 since the i5 has graphics.
The 240 Lite since we need to get the base PC working first.
The case since we don't need that to see if basic items work.

It sounds as if you put it all together at once. Try again but start small on cardboard. You only need the CPU, motherboard, one stick RAM, PSU to see video out.

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Attempted.

Just tried this and still nothing.

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Did you short the start pins on it?

to turn mobo on?

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Yep

Yeah I connected only psu, cpu and one stick of ram to mobo and tried both using start button and using a screwdriver to launch, which is why I’m leaning towards the motherboard being an expensive paperweight

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Answer
PS. Typical of case shorts.

If it worked for a time an extra motherboard mounting post can wear through and short out. That is why you start very very small.

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Attempted

When I say I had the motherboard working previously I simply mean that I had tested it in an older system while waiting for my new case to arrive which was delayed, so it was not present and in use for any longer than a few days at most

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Since it's dead with minimum parts.

You didn't reveal what you did with what parts. Anyhow, the usual case short is under 2 common scenarios.

1. The owner puts the new board in their old case and an extra stud shorts out the board. This can be instantly, delayed and may destroy the motherboard and at worst wipe out all parts in that PC.

2. The owner puts in too many mounting posts and again, same issues and possible results.

The only home method to figure out what parts are suspect are to make a PC without a case and as small as possible.

If it won't power up, we can get extra small. Right down to the PSU on its own. To test if the PSU may power up we use THE GREEN WIRE PSU TEST. Google that test.

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Apologies.

I apologise for my vagueness, it is a completely new pc build. The mounts are correctly aligned and numbered, and as far as I can see with all of the main components out there doesn’t seem to be anything which should be coming into contact with the underside of the motherboard. I will look that up now thank you!

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AS TO THE SHORT WITH A SCREWDRIVER METHOD.

That's not THE GREEN WIRE PSU TEST which is only done with a sacrificial motherboard or drive attached for a small load. Your better tech will do the GREEN WIRE TEST then check the PSU RAILS to see if all are close to spec.

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Answer
NOTHING happens?

If you do not even get the splash screen of the motherboard brand, my guess is that you have the PSU connected improperly to the motherboard or the power switch connected to the wrong prongs in that little bank of headers for such case features.

If you do get the splash, you may have your system drive connected to one of the SATA headers that were not intended for the system drive -- most motherboards have one or two of these.

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