Aprés installation de lion mon mabook ne demarre plus ! URGENT

Bonjour,
j'ai téléchargé et installé lion aujourd'hui,
jusqu'ici tout va bien ormis que mon PC ne vois plus mon macbook sur mon réseau.
Etant en train de travailler sur une application tactile destinée a windows 7 et préssé par le temps,
j'ai voulu partitionner mon disque macbook pour y installer windows.
comme je ne trouve plus mon CD d'installation windows j'ai arrété après la partition pour trouver une solution a mon probleme de réseau...
Suite a ca mon macbook ne veux plus démarrer.
J'ai un écran noir avec un petit trait blanc qui clignotte et rien après...
pourriez vous me donner une solution ?
d'avance un grand merci je suis vraiment très soucieux...
Cordialement
>Simon.

bon la solution toute simple comme je n'avais jamais fait de partition sous mac je ne la connaissais pas...
au démarrage j'ai simplement enfoncé la touche ALT puis choisis la partition de démarrage.
je vais de suite virer cette partition...
par contre si vous savez pourquoi mon PC ne vois plus mon macbook sur mon réseau local je suis preuneur...
j'ai bien vérifié mes parametres de partages sur les dossiers concernés etc...
merci.

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Aprés installation de lion mon mabook ne demarre plus ! URGENT

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