7 Key gone rogue

[ZenGum]

Whoah, the 77777777777777777777777777777777777777777777 key on my laptop has gone nuts.
It 777777777777777777has 7777777fi7ts o7f 7gener77ating 7constant sevenss but doesnt work when I try to use it. It does this as soon as the cursor is in a box that I could type text into, such as a post or the address bar.

Somet77imes I can stop it by typing another letter from the 77l7aptop. 7 77777I have isolated the external 77keyboar77d7 7777777777777777777777777777777with no effect.777 I have jiggled the key and am considering pulling it off to examine underneath77. This has happened on two different days77, ie7 I have restarted.
777777777777
This is how all my posts have been coming out lately. It is a fight to edit them without putting more sevens in.

Mac7hi7ne is7 777777777777a 7oldish Dell inspiron 1300, with Japanese keybo7ard and777777777777777777777777 a7nd hasn777t had a good software cle777an up ever.
7
Anyone got a7ny ideas? 7

And TW, don7t7 you dare say "not provided were specific numbers" Here are all the numbers you could want.
77777777777777777777777777777777777777777777777777777777777777777777777777
77777777777777777777777777777777777777777777777777777777777777777777777777
77777777777777777777777777777777777777777777777777777777777777777777777777
77777777777777777777777777777777777777777