First thing I'd do now is make sure the memory modules are installed in slots A2 and B2, which are the second and fourth slots over from the CPU socket. As seen here.
Then, do a hard reset of the BIOS.
BIOS Hard Reset procedure
Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.
Remove the motherboard CMOS battery for five minutes. In some cases it may be necessary to remove the graphics card to access the CMOS battery.
During that five minutes, press the power button on the case for 30 seconds. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.
If you had to remove the graphics card you can now reinstall it, but remember to reconnect your power cables if there were any attached to it as well as your display cable.
Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.
Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.
In some cases it may be necessary when you go into the BIOS after a reset, to load the Optimal default or Default values and then save settings, to actually get the hardware tables to reset in the boot manager.
It is probably also worth mentioning that for anything that might require an attempt to DO a hard reset in the first place, it is a GOOD IDEA to try a different type of display as many systems will not work properly for some reason with displayport configurations. It is worth trying HDMI if you are having no display or lack of visual ability to enter the BIOS, or no signal messages.
Be sure to go back into the bios and enable the XMP profile if you are running a memory kit that is supposed to be faster than 2133mhz. It will not automatically configure itself to the advertised speed without enabling the extreme memory profile in the BIOS.
All of which is ASSUMING that after making sure the memory is in the correct slots, is FULLY seated and a hard reset is done, that you CAN get a display onscreen. If you cannot, then remove then power off, remove the memory module from the B2 (Fourth slot over) slot and power back on to see if you can get a display then. If you still cannot, then swap that memory module, with the power off (Always, always, turn the power off and flip the switch on the back of the PSU to the "0" position when making hardware changes inside the case, then turn it back to the "I" position when done.) for the other memory module and try again.
If you still get nothing at all then double check that your 24 pin ATX connector and 8 pin EPS connector to the motherboard for the CPU are both connected and fully seated in their respective sockets on the motherboard.
Triple check everything here:
"No POST", "system won't boot", and "no video output" troubleshooting checklist This checklist is a compilation of troubleshooting ideas from many forum members. It's very important to actually perform every step in the checklist if you want to effectively troubleshoot your problem. 1.Did you...
forums.tomshardware.com
If it still doesn't turn anything up then I'd suggest you may need to remove the CPU and check for bent pins.
By the way, what PSU did you end up getting?