..silkington1..
An installer for macOS X on DVD media may include Snow Leopard 10.6.x.
Your example may have already had newer than DVD version installed. If
so, that might be able to use downloadable installers from Apple support.
Other ideas are better presented in order, here by HWTech:
•Something is wrong with my 2009 MacBook. - Apple Community (reply)
//discussions.apple.com/thread/254326854?answerId=258145577022#258145577022
• How to download macOS - Apple Support
//support.apple.com/en-us/HT211683
[Earliest DVDs could include those 'Grey Label' machine specific
versions; later ones would be retail-labeled Snow Leopard 10.6.x
Avoid download of Lion 10.7.5; there are issues; it goes nowhere.]
Totally new HDD or SSD presents need to use bootable installer.
Or other pre-installed Mac system on that new drive; bare drive
wire kits can be found at OWC site, to prepare external drives.
..An SSD may balk due to lack of proper updates to hardware..
