pic16f88 doesn't work at all

hi
i have two new pic 16f88 ...i made test program that make all pins high..delay300ms..low..delay300ms

i am using flowcode.....the two pics accept the program but doesn't work !

but the same program work fine with pic 16f628a..so the problem not the program!

http://p24i.imgup.net/16f882279.jpg

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