Kali linux black screen problem

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http://www.linuxfloat.org – Hello this is hanan....       i have problem with kali linux os the problem is that after booting the kali linux the screen compeletly become black (dark) but i don't know how to fix that P-L-E-A-S-E help me. also this problem is with other linux distribution such as backtrack,ubuntu,trisqul.i don't know is it possible to fix it permanently thanks for your kindness. My PC is hpG62 corei3    thanks for supporting me      (HowTos)