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On that damaged screw try getting a rubber band and put it between the screw and the screwdriver to dig in where the screw is damaged and removed it. Sometimes it works. You can also get a small drill and drill out the head of the screw to pop it off. Just be super careful not to drill a hole through your motherboard.
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I'm still discharging the battery, I will try the other solutions after that
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i would test ram and disk first - to be sure about the basics<br />
since it does not boot, remove these and test these on a working one, or have them tested at a shop
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I discharged the battery, but it still won't boot. The last screw in the battery is still giving me problems, tried rubber band and drilling, but not able to remove it.<br />
Now I removed the hard drive, and will try to get that tested at a shop.
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I have a feeling it's the graphics card that gives the problem, I'm not sure if it's possible to remove and if so how, this is what it looks like inside (see attached file).<a href="https://filedb.experts-exchange.com/incoming/2017/04_w15/1156486/IMG_1056.JPG" target="_blank" title="Inside laptop (3.2 MB)"><img alt="Inside laptop" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2017/04_w15/800_1156486/IMG_1056.JPG" /></a>
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IMG_1056.JPG

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maybe another brand ? 2 months is really a short laptop life
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It was the video card on the motherboard, so I have decided to buy a new laptop. Thanks all, for your comments.
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When I try to start my Lenovo U31 laptop, the screen is completely black and stays that way. The power and battery indicators on the left side are lid, so the power supply must be working. This problem started with Windows 10 being very slow to boot, first one hour, then two hours! After booting, it worked fine. I reinstalled Windows to try to fix this, but it didn't help. Now it won't start at all. I tried to remove the battery to take it out, then later put it in again, but the last screw was damaged. It looks like I have to break the plastic on the side of the battery to remove it. I have also tried to:<br />
- Get into the BIOS by pressing F12, but the screen is still black<br />
- Put a Windows install USB stick to see if it would boot on that, but no.<br />
- Connect via HDMI to a different screen, but it's still black<br />
Now I'm stuck, please advise me.
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When I try to start my Lenovo U31 laptop, the screen is completely black and stays that way. The power and battery indicators on the left side are lid, so the power supply must be working. This problem started with Windows 10 being very slow to boot, first one hour, then two hours! After booting, it worked fine. I reinstalled Windows to try to fix this, but it didn't help. Now it won't start at all. I tried to remove the battery to take it out, then later put it in again, but the last screw was damaged. It looks like I have to break the plastic on the side of the battery to remove it. I have also tried to:
- Get into the BIOS by pressing F12, but the screen is still black
- Put a Windows install USB stick to see if it would boot on that, but no.
- Connect via HDMI to a different screen, but it's still black
Now I'm stuck, please advise me.

Black screen on my Lenovo U31 laptop

Boot issue

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.