Question Windows 10 not sending signal to monitor when booting from SSD, but works flawlessly with HDD

[Srksi]

Long story in shortest: If I boot from SSD system will start fine, but I wont get any signal to monitor.
If I pick windows SSD instance from dual boot with HDD as boot device, system will load fine.
It all started when I wanted to install windows on my new SSD. Deleted old windows install on HDD, did proper install on ssd, but first second I set SSD as primary boot device, I dont get ANY monitor signal while system works fine in background. Found that way later after few hours when I gave up on installing windows to my ssd and went back to my hard drive, saw it actually created dual boot. Tried using integrated card just in case, but still same, its not case

 

[Lutfij]

It all started when I wanted to install windows on my new SSD. Deleted old windows install on HDD, did proper install on ssd, but first second I set SSD as primary boot device,
What I usually do when I need reinstall the OS onto an SSD while the existing OS install is on an HDD, I tend to backup all mission critical data off the HDD, format the partition with the OS and relevant OS partitions using a bootable USB installer. Then I disconnect the HDD from the system, then install the OS with only the SSD hooked to the system.

 

[Srksi]

Then I disconnect the HDD from the system, then install the OS with only the SSD hooked to the system.

Tnx, that option do passed through my mind few times, will try it when I calm and fix few even worse problems, but still, with my luck that wont be just boot clash, Im expert in attracting unsolvable problems... 🙁

 

[Misgar]

Deleted old windows install on HDD,

Did you delete the hidden partitions on the hard drive or just the visible partition containing Drive C:? Failure to remove all the partitions may result in boot problems after installing the new OS.

When I'm upgrading a computer or laptop from hard disk to SSD, I keep the operating system on the hard disk and clone it directly to a new SSD. When cloning is complete, I unplug the hard disk's SATA leads and boot from SSD. Caution: Do not leave the old drive connected the first time you boot from the newly cloned drive.
https://www.macrium.com/reflectfree

The whole process usually takes less than a hour and you end up with Windows and all your programs plus data on the faster SSD. You can plug the hard disk back into the computer and keep it as a spare OS in case the SSD goes bad.

did proper install on ssd

Did you unplug the hard disk drive before attempting to install Windows 10 on the SSD? It's a wise precaution to disconnect all other drives before installing an OS. It saves confusion and the possibility of wiping all your precious data by mistake.

went back to my hard drive, saw it actually created dual boot.

By "dual boot" do you mean you now have two Windows 10 operating systems on the hard disk? It's more common to have Linux and Windows on one drive if you want to "dual boot".

I have a very old system with Windows XP and Windows 98 running on the same hard disk (in different partitions) i.e. I can boot up into Windows 98 or I can boot up into XP from the same drive.