Macbook Pro: white screen on startup


hello!

happened salvage old 2009 macbook pro 15 inch non-retina. didnt come hard drives , os, threw in ssd , made bootable usb drive macos mountain lion, in hopes of upgrading os later.

issue when hold down control access startup options on boot, comes white screen , cursor, , nothing else!

i've tried loading safe mode , recovery system. short time apple logo showed i'm getting file question mark, regardless of do.

i've done nvram , smc resets, unplugged ssd , ran usb itself, unplug battery bit, , other jazz. still no luck.

first apple product i'm new , forums, made bootable usb windows 10 using transmac. don't know if make difference i'm throwing out possible options.

ideas/tips on how fix this? said i'm new appreciated. thanks!
 



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