Unfortunately there are a fair few avenues we may need to take to diagnose this. There can be endless amounts of things that go wrong but we will hopefully get it going.
Now when the PC loads does it only ever give you a black screen? Is there at any other point somewhere when there is something on the screen?
If not then try attaching another external monitor to the laptop. Then turn on the laptop and if something comes up on the external monitor then there is a graphics/screen issue.
Also follow This Guide
. Go down about 1/4 of the way to were it says Test for memory module errors
. Look over the part were it tells you how to remove the backplate. Then:
- Turn off the Laptop
- Remove the backplate
- Remove One of the sticks or memory. Place it on some cardboard and never on carpet or some plastics
- Close the backplate
- Turn on the Laptop
If the laptop boots up and displays something you have your culprit. If not then carry out the same process with the other stick by taking out the on still plugged in and replacing it with the stick remove earlier. Keep doing this until each stick of memory has been tested by itself.
However if you do get something on the screen when you turn on the PC I would advise that you run Memtest.
Please follow this tutorial:How to use Memtest
Follow through and then post back with any errors that the PC may give you