Hi. I've changed my old hdd into a ssd today in my lenovo y580 laptop. During disasemlby I've decided that I will clean my laptop. I've taken apart everything including trashing old thermo paste and replacing it with fresh one. Then when I start my laptop it goes to Lenovo logo(1-2second) and shuts down(with either ssd or old hdd plugged in). However if i start it without any hdd it goes from Lenovo logo to "checking devices" for about 2seconds and then turns off. I checked and memory seems ok(got 2 sticks) and checked both slots. Fan is spinning normally. Than I also trashed old thermal pads near cpu and gpu and put new paste there. Still same thing. Kinda desperate to solve it because I need this laptop for my studies. Thanks in advance!