Laser level tools are always important for housework. Some of the best novice options on the market come from DeWalt, and ...

Some vertical lines have started appearing on my Lenovo laptop screen. It’s about three years old. I’ve turned it off and on again but nothing seems to work. Will it be expensive to repair?

Nail Trauma or Injury A nail injury can cause a dark line on your nail. Physical trauma damages blood vessels beneath your nail, which causes blood to pool and appear as a dark vertical line.