Many years ago when I used to visit a local computer recycler (long since defunct) and purchased an IBM PS/2 Model 30 286 system. The system would boot up maybe once in 100 tries (HD issues). Anyway I took the controller board off the hard drive (proprietary connector) and noticed the aluminum caps were all leaking. The capacitors were funky values so I set the drive on the shelf for a few years until recently. I couldn't find aluminum capacitors that matched so I went with a more common type. SO after 3+ years the system boots every time now. Of course the drive has bad sectors but the system is 100% stock and running.