You may try Aliexpress: https://www.aliexpress.com/item/32963012...-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_s...--N5MZvixoCn-kQAvD_BwE&gclsrc=aw.ds&aff_fcid=6030a8b8...-1645894308668-08793-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=a...-1645894308668-08793-UneMJZVf&terminal_id=90f407931ff74cd5b16...

I’m not sure if we are allowed to post a link here, but here is a video that gives you the instruction step by step: http://www.powerbookmedic.com/manual.php...

Try to remove the PC3L/12800S, then you will find out if it is the one causing the issue.

The answer, unfortunately is not definitive.  Usually, yes. But, because of no strict standardization enforcement it may not work. I’d say better to order DDR3 if that is what originally came with your motherboard. I bought 3 PC3L RAM different brands all did not work on my PC3 system.