Question Swapped hard drives

Aug 13, 2019
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I recently got hold of an older HP Media laptop with Win7 installed. I swapped out the hard drive for one with Win10. When I start up the laptop, it's telling me that no OS is installed. I could use some guidance, please.
 
Did you ensure that the Windows10 disk was successfully booting in the coputer it originally came from?

Do you have other storage devices connected to the laptop (that it may try to boot from) ?

Maybe the drive have GPT partition table while the laptop only support MBR.
 
Aug 13, 2019
2
0
10
The drive came from a dead screen laptop. All drive tests pass. I thought that maybe it was the "Optane" memory, but it's not. The "new" drive did work fine when I put it in my desktop. The old drive works, but it's Win7. And there are no partitions.