New PC build, no post, no USB power

[Mason Methot]

My tech teacher bought new PC parts for a build, and ordered me and someone else to build it.
We did everything correctly, nothing wrong, not many components.
We powered it up and all the fans lit up and started spinning. Motherboard RGB lights lit up and the hard drives span. Everything worked component wise, except we weren't getting any visuals. The USB hubs weren't working either, any of them. We tried dvi and HDMI, 2 different monitors, and 2 different keyboards. Keyboards did not light anything up.
We checked all cables, basically took it all apart and redid the build and closely analyzed all components. We couldn't figure out the problem, though it is probably super simple.

I thought dead motherboard at first.
She may have brought it back to the store last night for them to look at it but I don't know. In case it is still here, what can I do to solve this?
All components should work together.

Specs:
Motherboard Asus B150L (mini itx)
CPU Intel (can't remember exact model) i5 (LGA1150)
8GB CORSAIR ram
Corsair cx500 PSU
1tb HDD WD
250gb Kingston SSD

 

[alexoiu]

The CPU model is important, to rule out a BIOS issue.

 

[boosted1g]

As mentioned, CPU model is important.
If cpu model is a 7th gen kabylake then that is your problem because your montherboard in its current state does not support that cpu.

 

[Mason Methot]

I'll have to find out in about an hour if it's still there. You're probably right in it being the wrong one.

 

[Mason Methot]

The CPU is a it 7400
MB and CPU are lga1151

 

[alexoiu]

The board most probably does need a BIOS update for supporting the kaby.
Option: Order a BIOS chip on ebay and replace the board's one.
Other options: using a supported CPU for updating the BIOS, returning the motherboard, or the CPU...

 

[Mason Methot]

The board most probably does need a BIOS update for supporting the kaby.
Option: Order a BIOS chip on ebay and replace the board's one.
Other options: using a supported CPU for updating the BIOS, returning the motherboard, or the CPU...

Is returning an already used CPU to the store an option if it isn't broken?
I don't know what the cheaper option here would be. I suppose buying another motherboard wouldn't be a bad choice (It would be nice to see a motherboard that fills up a full case rather than that little mini itx in there)

 

[Paul NZ]

There is no B150L. There's a B150 Pro gaming D3, Pro, B150I Pro gaming / wifi / aura

 

[alexoiu]

The board most probably does need a BIOS update for supporting the kaby.
Option: Order a BIOS chip on ebay and replace the board's one.
Other options: using a supported CPU for updating the BIOS, returning the motherboard, or the CPU...

Is returning an already used CPU to the store an option if it isn't broken?
I don't know what the cheaper option here would be. I suppose buying another motherboard wouldn't be a bad choice (It would be nice to see a motherboard that fills up a full case rather than that little mini itx in there)

Yes, it could be an option, if the retailer accepts it.

 

[jay_rogers]

Have you performed this steps?
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems