CPU or MOBO dead?

[WoolyBear]

Hello all!

 

So when I woke up this morning I sat down to a completely frozen PC. No error message or blue screen. Just normal windows desktop but not accepting any mouse or keyboard input. Tried restarting the system by holding the power button for 10s but nothing happened. So instead I restarted the power on the UPS ( which is still working). The PC did shut down but now it will not start.

 

No fan spinning no beeps no LED lights on mobo nothing happens when I hit that power button. 

 

I'm using the Asus Z390-F mobo and interestingly the RGB bling at the top left still lights up when power is connected to MOBO as do any peripherals like the keyboard. Still tested another PSU just in case and same issue. 

 

Tried resetting CMOS both with the pins and by removing and reinserting the battery.

 

Have tried booting with no peripherals no boot devices and only one stick of ram and nothing. 

 

Also removed GPU and connected monitor through iGPU with no change.

 

System is

Intel i9-9900k

Asus Z390-F

16GB Geil RAM

PNY XLR8 2080Ti

1TB HP EX920 nvme (boot drive)

2TB Seagate Firecuda HDD

Windows 10 Home 64 bit

Cooler Master H 500 case

Cooler Master 240mm radiator 

 

So how do I tell between the CPU and MOBO which has died?

Edited July 24, 2019 by WoolyBear
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[SenioRR]

You should be able to power it up without a CPU; the fans should be spinning etc.

Try shorting the pins on the motherboard to power it up too, just in case.

If you take out the CPU and nothing happens when you press the power button, then it's the motherboard.