This can happen because of these reasons :
1. Your display (LCD Screen) has gone bad and needs to be replace.
2. The cable connecting the motherboard and the display has a crack or is loose. (mostly this is the issue because it disappears n reappears)
3. The graphics chipset (on motherboard) has issues. (rare)
Connect an external monitor to this laptop and if that works fine then issue 3 can be ruled out.
Note: After you plug in external monitor, you might need to press Fn + FX (X =1 to 12) keys to toggle to external monitor. FX is one of the Function keys.
This is not a software problem and needs repair/replacement of the malfunctioning part.
If laptop is in warranty contact toshiba for free repair. Else take a quote from few shops and then get it repaired.
Feel free to ask any question or concern you may have. I will be glad to help you.
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