|Hi Kaastroo, If the graphics card is separate (not integral with on the mobo), as it appears this may be at fault, I would first reseat it a few times:-|
With the power *DISCONNECTED*, remove the board and reinsert 2 or 3 times.
You would be surprised how many faults this procedure has cured!
Or once, if you have a soft rubber typists correction pencil, use to clean the board's contacts.
Take care - avoid touching any contacts or electronic components, unless you are wearing a earthing strap.
Please advise back on progress.
Good luck - Keep us posted.