Unplug the external and try again.
Back up your saves to the cloud or a pen drive and then restore to factory.
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I think all my saves are backed up already, but restoring to factory will mean re-downloading my games for a week straight. (slow internet) Thanks though.
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If it means possibly fixing your console you're going to have to do it. You could try contacting Sony but they'll likely tell you to do the same.