I have a lenovo Y510p laptop. It quit charging the battery so I ordered a new AC adapter. Plugged it in and it fried it. Sent it off to lenovo although a month or two out of warranty and they said they replaced mother board and other items and it still would not work. So they shipped it back to me. I have tore it down to bare bones. Mother board, external monitor and memory. And it boots up. But when I add the wifi card or SSD it will not boot. I thought they may be faulty but took a wifi card out of another laptop and same issues. My AC adapter says it is supposed to be 19.5 V but only reads 18.98 V. Is it not getting enough voltage to power everything or is there something else going on? I am not a computer geek by any means just trying some scientific methodology to find out what the issues are. Thanks for any help.