Keyboard locks up after keying NUM-LOCK or CAPS-LOCK

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Problem:

Keyboard locks up after keying NUM-LOCK or CAPS-LOCK

Resolution:

Some early AMI BIOS ROM's have a timing problem in the

  keyboard controller. Boot the system and read the BIOS serial

  number: if it ends with KA,KB,KC,KD,KE or KF, this is one of the

  bad chips. Even though AMI has not made these chips since 1986,

  some computer manufacturers still have them in stock. The only

  solution is to replace the keyboard controller chip.

Old KB# 11555
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