TWO BUILDS. NEITHER POST. HELP.
The first time you start an AM4 it can take up to a minute for the bios to initialize and do its job and test the memory sticks and all that. Usually it takes less time, maybe 10-30 seconds but it can take more.
If you keep turning off psu after a few seconds, it's never gonna finish. So maybe be patient.
Next, I'd minimize the configuration .... pull the motherboard out the case, put it on some cardboard box or something that's insulator (plastic for example), just in case there's something wrong with your case and shorts something on the back of your power supply.
Connect just the 24 pin and 8 pin cables from the power supply , install just one stick of ram in the furthest slot from the cpu, if possible install a speaker to the header (or use some headphones, place the jack across the speaker pins) and start the computer by shorting the two power on pins in the front panel connector with a screwdriver for a second
The motherboard may have debug leds somewhere ... wait and look at the leds and see if some led remains lit. The board should have the cpu fan spinning and should make a series of beeps in the speakers which tell you no video card is detected. If any, the vga led would light up.
The board may be stuck "training" those ddr4 sticks, unplug power supply, pull out battery, wait 5-10s, put battery back in.. your bios settings are reset.
Another way of seeing if the bios actually works is by plugging an old PS/2 keyboard ... if you can press num lock and flip the led on / off, that's a sign the bios has initialized enough and there's cpu working to handle keyboard interrupts and the keyboard receives commands from the bios, so your computer is not frozen.
You can buy an ancient pci-e video card for around 10-15$ and you can have that around to test if your video card is gone.
FOr example: Windows 10 DUAL DVI MONITOR Video Card. 512MB GDDR3 PCI-E x16 Low Profile DELL | eBay
or this (but you need to buy a separate DMS-69 to 2 x dvi/vga) : Dell ATI Radeon PCI-E Dual Video Low Profile Graphics Card HD2400 102B2670201 | eBay
Considering how much you paid for all those parts, 10-15$ investment in a card is not that big of a deal.

Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now