hd gone cannot bootup

iFixit is a parts seller. They do not do repairs. This forum is mainly manned by volunteers who do not work for them. Skill levels of those who respond vary greatly. There are a few professionals who contribute to the site who can help you with this problem. I would click on the Users tab to see a list of them. You can them click on their icons to see if they are in the business. If they have a web site or email listed on their blog you can check them out. If their photo is dark sepia, then they work for iFixit.