After you replaced the hdd did you:
Reinstall windows?..................not a restore of some backup.
Install all the mobo drivers?
Visit the mobo maker's site and get the latest drivers?
What does the manual say about these lights?
Post a speccy....how to:https://www.piriform.com/docs/speccy/using-speccy/publishing-a-speccy-profile-to-the-web
I recently replaced the hard drive on my computer (as it had bad sectors) while it stopped many errors such as the computer not booting, freezing upon startup and bsod-ing there is still one puzzling problem
The pc sometimes still freezes, its a lot better than before but it still randomly freezes sometimes
However one major difference is that before replacing the drive ony one light in the chassis used to be on when it froze but now both lights are on
This did not used to happen at all a few years ago - the only things that froze were programs( such as chrome etc)
I ran chkdsk and sfc /scannow and it shows no errors

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