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But with this "I changed to bios2 and it was fine" it would seem your Bios 1 is corrupt.
Boot into the Bios on Bios 2 and then change back to Bios 1 and Re-Flash it.
All your Power Cables Connected and Locked in?
8-Pin EPS/CPU & 24-Pin Cables and locked on both ends MB and PSU. 

rfbzbr
All cables are plugged in properly, I've reseated them many times now, bios 1 and 2 are doing the same, all I get is an instant FF error code, I've taken the processor out and placed it back carefully. I don't know what else to do, every time I press the reset CMOS button I get C then FF right away

So then Bios 2 never worked?
Did you look to see if you bent any CPU Socket Pins?
Do you have another Power Supply to Test with?

I was on bios2 last night, then this morning it would not boot, then I tried switching to bios1 didn't boot, tried switching back to bios2 and it didn't boot either.

I'm so confused...

Motherboard
Make: Evga
Model: z370 ftw
Bios Version: bios1 1.06 bios2 1.14 I think
Is Bios Current Yes or No.
CPU
Model: i3 8100
Settings:

Memory
Make: Corsair
Model: lpx 3000mhz
Settings:

M.2 Devices: No
Socket 1:
Socket 2:
Socket 3:

GPU/Video Card
Make: EVGA
Model: GTX 970
Driver Version: ???

GPU/Video Card
Make:
Model:
Driver Version:

GPU/Video Card
Make:
Model:
Driver Version:

PSU
Make: EVGA
Model: 500 bq
AGE: less than a year
Using One PCIe Power Cable or Two Separate PCIe Power Cables? One
Location US, EU, Other for Voltage or Power. US

Monitor
Make: dell
Model: cat remember
Video Cable Type Used: DVI

Monitor
Make:
Model:
Video Cable Type Used:

Monitor
Make:
Model:
Video Cable Type Used:

TV’s
Make:
Model:
Video Cable Type Used:

Other PCI/PCIe installed Devices
Make:
Model:
Slot Number Installed:
Driver Version:

Other PCI/PCIe installed Devices
Make:
Model:
Slot Number Installed:
Driver Version:

OS:
OS Version: win 10 1803
Service Pack Level:
Windows/Patch Level:

rfbzbr
I just replaced the CMOS battery but nothing changed, and also I tried my PSU on a different mb and it was okay

That is fine that it worked on another MB but it could still mean that it is not working on your MB.
I have PSU like the 1300 G2 that will work on some Motherboards but not others.
Your 500 bq is a little small for your setup.
Did you check to make sure the Pins are pushed in all the way on the Connectors and on both ends of the Cable.
I still thing you need to test with a different Power Supply at least a 650 Gold

Bent CPU Socket Pins
Bad CPU
Bad Memory
Bad Power Supply
Parts do fail.
 
Are you using a UPS Unit or at least an good Surge Protector.
A Power Strip is not the same as a Surge Protector.

rfbzbr
I am using an UPS, tried the wall outlet directly and it's the same. No bent pins, I didn't remove the CPU until I had to for testing purposes.

BTW, before it was staying at FF steadily, now it shows FF and turns off right away

What CPU Cooler are you using?
Maybe it stopped working.
Or maybe need to replace the Thermal Paste.
I will add that to my list, thanks

Without testing with another Power Supply all you can to is Request an RMA by starting with creating a Service Ticket on your Motherboard.

I did, tried the wall outlet directly, also a power strip. It's still the same, I let it overnight with everything unplugged I'm going to put everything together now and see what happens.

I have the mobo out of the case on top of the mobo box, I unplugged everything, removed the CMOS battery, removed the CPU from the mobo, let it sit for about 15mins, then placed the CMOS battery in the mobo, put the CPU back, then CPU cooler, put the ram and all the other components as gpu and boot hdd, still getting the same, straight FF code on both BIOS

I don't have another CPU or PSU, I may be able to test my CPU in another computer at the office but I'm not sure I can do that yet.

Try basic necessities first.  

- CPU (Did you check for bend socket pins?)
- MB (Everything needs to be run on default/stock.)
- 1 Stick of RAM (Make sure which slot that one stick goes into).  If that don't work, try the other stick.  If both don't work, try using memtest to see if the stick(s) are bad.
- PSU
- OS Drive

That's it and go from there.

rfbzbr
No bent pins, everything is on default/stock on the mb, used only one stick in the right sicket, tried both sticks actually one at the time, how can I use memtest without getting into the bios? I'm gonna buy another PSU and see if that helps

Just noticed that you also sent us an email that you were directed to do so by our EVGA Support twitter account. Try testing the CPU in another system or another CPU with your system. Let us know your finding by responding the email from SMsupport@evga.com

rfbzbr
Guys, I bought another processor and that was the issue, tried mine in another system and that didn't work so I bought another one and hoped for the best, it worked!

btw my board booted up no issues with bios 1.06 using an i5 9400F which is odd.

Anyway just wanted to thank you all for all your suggestions

I got a cheap $50 CPU for testing Motherboards.