I have a pretty strange problem.  I woke up one morning and my PC was completely dead, wouldn't turn on, didn't seem to be getting any power at all.  I replaced the PSU (had a Corsair 1000w, replaced it with an EVGA 1000w).  Still dead.
 
So I contacted the motherboard mfg, and they gave me a warranty replacement.  Got it installed, still dead.  So I got irritated and replaced the MB and CPU with an EVGA motherboard (I've always preferred EVGA, but for some reason on the last build I decided to use ASUS ROG).  Just finished the rebuild, was excited to get back into a game or two, set it up. . . still dead.  I'm about ready to commit hari-kari.  At this point, I don't even know where to go.  The PSU is new, the MB is new, the CPU is new.  The video is an EVGA RTX2080, Corsair memory.  
 
It's like it's not getting any power at all.  I know the outlet and the power cord are good, as I used them on another PC and it worked fine.  
 
Any suggestions on where I go from here?
 
Mike

Recheck front panel connectors, ensure the motherboard is sitting on risers and not shorting from any metal contact between the case chassis, verify that all power plugs are connected and fully seated, ensure the CPU has thermal paste and the heatsink is secured firmly without flexing the board, minimal setup with one stick of RAM and no GPU, check that the display has power and has input, check that the PSU switch is set to "|", check that the power cord has a firm connection between the PSU and wall outlet.

Otherwise, something's still dead

Everyone with good advice so far.

I'd pull the mobo, remove the GPU, use 1 stick of RAM, and use the mobo's built in power on button (if it has one) and try to see if you can get it to start up outside the case just so you can eliminate two or three variables at once.

I guess it's worth asking if the outlet works with other things plugged in.
 
I have had an issue once like this and it turned out it was a short in the fan controller on the case. It didn't even matter if the fan controller was plugged into power or not just it being inside the case would cause a problem getting power after it burnt out. 

rmorse27
take the motherboard out of the case set on desk hook up power supply try to start pc if it boots that means you have something grounding out in the case.

Eventually, it always comes down to this if you've tried everything else.  The good news is that if it works, it probably means reinstalling everything again will take care of the issue.
 
Which EVGA 1000W PSU?  Most of them come with a PSU tester to verify that the PSU will turn on.  Make sure ECO mode is turned off, if it has that feature.  Plug the tester onto the 24pin connector, then flip the PSU on.  If the PSU fan turns on, then you know the PSU is good. 
 
From there, check the cables and make sure none are plugged in backwards (like the PCIe or EPS connectors).  If everything looks good, just try the MB with a CPU installed, one stick of RAM, and the 24pin/8pin power connectors plugged in.  Instead of using the front panel header wires from the case, use a small flathead screwdriver to bridge the power connector on the motherboard.  If it suddenly turns on, then it means there's an issue with the FPH wires from the case, or they were just installed incorrectly. 
 
After that, it's just a matter of putting it back together or trying things one at a time until you determine the cause or if it might be nothing more than a little dust got itself in a place where it shouldn't.

the_Scarlet_one
We keep getting more and more replies of what to try, and OP hasn’t said anything since posting… hopefully they return with something, and hopefully it is good news. At this point, it’s a waiting game as pretty much every single thing has been said that is a possible solution.

OP is either doing okay now, or something has gone catastrophically wrong.