Satelite a215-s7437 only boot with external harddrive usb atached

My laptop a215-s7437 boot but after the logo i have a black screen no mouse or anything, but If I connetc my external harddrive conected with usb It will boot and works find
I have no ideia wha is wrong ????
Please help.........

Wow, that seems very odd to me!
Have you tried resetting the BIOS to defaults? See if that works.
If not, try updating the BIOS.
ACPI Flash BIOS version 2.00 for Satellite A215 (PSAFGU/PSAFHU) 32/64-bit(v2.00; 02-24-2010; 6.1M)
If you still can't solve your issue and no one in the community can help, contact support to speak with a tech support agent at (800) 457-7777.
- Peter

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