not posting PC no longer Posts after reboot for software installation

[Spider Jones]

I performed a software update on my Windows 10 desktop PC, and when the installation informed me it needed to reboot I did so.  After that the PC doesn't seem to Post. 

 

All fans spin, HDD Led is rapidly blinking.  As this software was related to tuning the case fans and specific to the MB my first instinct was to replace the motherboard assuming the install had some how bricked it (troubleshooted before doing this but with nothing working this is what I went with).

 

There was no change with the new MB, so I've replaced almost all the hardware in my PC bit by bit but am getting the same results.  New CPU, PSU, RAM...  Still the fans spin up, no display, no sounds, just the rapid blinking LED.  I've reseated the entire system several times (and even returned and tried other hardware along the way).

 

All hardware is compatible (though the CPU is older and throttles the GPU).

 

MB: MACHINIST B75 Gaming Motherboard with 256GB SSD Internal Solid State Drive M.2 2280 NGFF 500Mb/s 3D NAND TLC AHCI SATA III 6Gb/s LGA 1155 Computer Motherboard for Intel i3,i5,i7/Xeon E3 V2/Pentium

CPU: Intel Core i7-3770 Quad-Core Processor 3.4 GHz 4 Core LGA 1155 - BX80637I73770

PSU: Corsair CX-M Series, CX750M, Modular Power Supply, 80 Plus Bronze, Black

GPU: EVGA GeForce RTX 2060 SUPER SC BLACK GAMING, 8GB GDDR6, Dual Fans, 08G-P4-3062-KR

RAM: Corsair CMZ16GX3M2A1600C10B Vengeance Blue 16 GB (2x8 GB) DDR3 1600MHz (PC3 12800) Desktop Memory 1.5V

Storage is Crucial MX500 1TB 3D NAND SATA 2.5 Inch Internal SSD, up to 560MB/s - CT1000MX500SSD1 Blue/Gray

 

I've checked that all power cables are connected multiple times.

I've booted the system with only a monitor with no peripherals connected.

The monitor works on my other system, so no issue there.

Have reseated all cables several times.

Have reseated all hardware several times.

Have tried clearing CMOS.

 

Thank you for any help.

 

[BiotechBen]

Sounds like you might have corrupted OS? Or the boot device has failed?

 

The no post is what is strange.

[SirWendall]

Fan software? Maybe its messing with the CPU fan header and it trying to post?