First off, the laptop's a Lenovo B50-70.
Today I was using my Laptop to host a database server in my local network, letting it idle on my desk. When I wanted to turn it off the screen had turned off and wouldn't turn on, no matter what, so I had to perform a forced shutdown by holding the power button. This is an issue I had frequently since the upgrade to Windows 10. Only this time, the Laptop wouldn't turn on afterwards. No fans are starting and no lights turn on (except a blinking LED, see below).
I already took of the battery, tried to hold the power button for several seconds, put the battery back in. The usual stuff. I opened the laptop but couldn't find any obvious problems (Moreover, I lost two screws while doing this, even though being extra careful...).
When pressing the power button the power led on the side of the device blinks 3 times in succession. I believe this is the relevant error code. I do not have the manual anymore, nor do I find relevant information on the web, or in the online available manuals.
I am able to save the data on the hard drive myself, there is not even anything important data on this device. But it would be a huge inconvenience to not have the device available in the coming days.
Is there any chance I can fix this myself or is there no way around giving it to repair, based on your remote diagnosis?
P.S. As I am new to this stackexchange please feel free to add any relevant tags. I am struggling to choose appropriate ones.