Laptop keyboard not working

[sososo]

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I have Dell Vostro 1000.
my laptop keyboard not working.

Using 10.5.1

[zephyroth]

Did you disabled "USB Legacy" in BIOS ?

[sososo]

After Disabling USB legacy my external hard disk is not working.
Mac os x installed in USB hard disk.

[WinLinMac01]

try the new release, 10.5.2

should work I suppose