Try boot with Linux live version. If it fails, problem is hardware.
Dont know anything about linux
Try to access BIOS using Delete or F10 or F11 or F12 etc. keys, if you cannot then it is hardware failure. Not easy to diagnose, it require experience and knowledge. Therefore need to get support from manufacture or 3rd party providers.
Sometimes, resetting the BIOS might also do the trick. How to do that varies though which each motherboard.... ( I was lucky enough that the MB on my system had a clear CMOS button on ther back when I had this happening to my system, though that was not related to any update.....).
I had such a problem, twice now actually, after updating the bios on my Gigabyte motherboard with a B450 chip (runs AMD Ryzen CPUs) and to remedy it on boot I go into the BIOS and rearrange the boot devices to but the device with Windows 10 system disk first, save, reboot, and that takes care of it.
I know many computer savvy folks here so hopefully someone can help. I had a windows update listed. Did an install power down sequence. The computer never shut down and probably did not reboot. I hard shut it down this morning. It no longer boots. I think not even post. The lights go on, memory flashes, fans on but no more light no keyboard, nothing on monitor...the GPU signals not going to monitor. I've tried rebooting, removed different ram sticks, disconnect gpu and attempted on board, everything is unplugged from system. Nothing. The system mfg is near impossible to contact. Any ideas? Oh, I took out cmos battery to to get that to default.
Any light at all, ever, on the display? If not, then double check your monitor(s). If you have more than one, perhaps the graphics card has switched default output to a single monitor that happens to be off? (Happened to me a couple of times.) OOPS, nevermind, I just re-read your post and you've already tried removing the graphics card.
OK, are there any blinking lights at all? Disk LEDs, network activity LEDs, motherboard LEDs, etc.? I'm still working on the assumption that the machine is working but you just can't see it on the display.
If you have a nice enough motherboard it would have some LEDs that might be lit to indicate how far it got in the boot process. Find (or lookup) your motherboard documentation.
Um, the monitor is working isn't it? Are you sure it's plugged in? (just had to say it)
Ditto on the suggestion from @glaseye...I would make sure that it's not the BIOS before moving to bad hardware...especially if you had no odd symptoms beforehand. Some motherboards come with a backup BIOS, which is very nice indeed because if the primary BIOS bricks, then the backup will engage and overwrite the primary. I miss that feature with my previous Gigabyte motherboard. I currently have a MSI motherboard and the one time my BIOS borked up, I had to reset it by removing the CMOS battery for like 5min.
removing CMOS battery may not be enough you have to short it to discharge everything
Yeah, you have to give it a bit to make sure there is no charge left. I was just reading on a reddit thread someone suggested to take the battery out and then go drop a nice long bm and by the time you're done, it'll be ready to go, lol.
well, i took the cmos batter yout for the 6th time and it finally booted to where I could get into BIOS... tried to OC my ram back to 3200hz and it would not boot. Had to remove battery again...went back in BIOS and changed what had to be but left ram default. its working. It is more than angry that the ram will not work at full indeicated speed a real rip off..but it could be a system problem not allowing it to go full tilt rated at 3200mhz. The MB is supossed to go to DDR4 4400mhz. I did have it at 3200 before and it was working fine. I will try to get it there again after a few days when I have all my backup and recovery stuff in order.
Thanks everyone for the suggestions
If you believe it's the RAM that's the issue, and it sounds like it may be, you should definitely run a diagnostic tool like memtest over night. https://www.memtest86.com/
If there's any errors at all, the ram is bad (if it's a kit and one stick is bad you should replace both) and you should contact the seller for replacement.
Comments
Does it stop before or after trying to start Windows? Can you get into the start menu? Can you boot from USB stick or CD?
The only time something like that happened to me was with a flaky power supply. Troubleshooting basically means replacing it. Got a spare?
Try boot with Linux live version. If it fails, problem is hardware.
DELETE
DELETE
DELETE
Try to access BIOS using Delete or F10 or F11 or F12 etc. keys, if you cannot then it is hardware failure. Not easy to diagnose, it require experience and knowledge. Therefore need to get support from manufacture or 3rd party providers.
Sometimes, resetting the BIOS might also do the trick. How to do that varies though which each motherboard.... ( I was lucky enough that the MB on my system had a clear CMOS button on ther back when I had this happening to my system, though that was not related to any update.....).
This video might help a bit...
I had such a problem, twice now actually, after updating the bios on my Gigabyte motherboard with a B450 chip (runs AMD Ryzen CPUs) and to remedy it on boot I go into the BIOS and rearrange the boot devices to but the device with Windows 10 system disk first, save, reboot, and that takes care of it.
Oops, double post.
Any light at all, ever, on the display? If not, then double check your monitor(s). If you have more than one, perhaps the graphics card has switched default output to a single monitor that happens to be off? (Happened to me a couple of times.)
OOPS, nevermind, I just re-read your post and you've already tried removing the graphics card. 
OK, are there any blinking lights at all? Disk LEDs, network activity LEDs, motherboard LEDs, etc.? I'm still working on the assumption that the machine is working but you just can't see it on the display.
If you have a nice enough motherboard it would have some LEDs that might be lit to indicate how far it got in the boot process.
Find (or lookup) your motherboard documentation.
Um, the monitor is working isn't it? Are you sure it's plugged in? (just had to say it)
Ditto on the suggestion from @glaseye...I would make sure that it's not the BIOS before moving to bad hardware...especially if you had no odd symptoms beforehand. Some motherboards come with a backup BIOS, which is very nice indeed because if the primary BIOS bricks, then the backup will engage and overwrite the primary. I miss that feature with my previous Gigabyte motherboard. I currently have a MSI motherboard and the one time my BIOS borked up, I had to reset it by removing the CMOS battery for like 5min.
DELETE
take out all the ram and try to turn it on (you need to have beeper connected )
then it should start beeping because it has no ram which proves that more or less everything is working on the cpu side
removing CMOS battery may not be enough you have to short it to discharge everything
Yeah, you have to give it a bit to make sure there is no charge left. I was just reading on a reddit thread someone suggested to take the battery out and then go drop a nice long bm and by the time you're done, it'll be ready to go, lol.
DELETE
Glad you're working again, but don't you hate it when your memory gets too pooped to play?
If you believe it's the RAM that's the issue, and it sounds like it may be, you should definitely run a diagnostic tool like memtest over night. https://www.memtest86.com/
If there's any errors at all, the ram is bad (if it's a kit and one stick is bad you should replace both) and you should contact the seller for replacement.
buggers never told me I could get a replacement when one of my sticks carked it