laptop won't start

Hi! My ASUS N56VV Laptop that I purchased 10-12 years ago wasn't used for a few years, and before that it was used rarely - about once a year. Then I decided to turn it on, and I have the same problem: 1st pessing Power button: CD-ROM test Starts & stops (like normal startup), keyboard...

I have an HP Elitebook 820 G4 and earlier today I went to try to turn it on & it just wouldn't start up. The screen stayed black. But the keyboard light would flash on and off and so would the fan, the fan would spin for like 2 seconds stop then spin again for 2 seconds continuously like it kept...

I have a powered USB hub, I found a power supply that I thought was for the powered USB strip, I plugged it in and then plugged the USB strip into my USB port on my laptop. It immediately shorted out. After doing some research I found that this was NOT the correct power supply and it had much...