IBM B50 - Manual (Page 106)

1. Locate jumper J15 using the following illustration.
J15
2. Remove any adapters that are blocking the jumper.
3. To move the jumper, first touch the metal frame of the server, then gently pull
upward on the small box (jumper) covering the pins.
To enable the automatic power-up feature, place the jumper over the rear
two pins.
To disable the automatic power-up feature, place the jumper over the front
two pins. This is the factory default setting.
4. Reinstall any adapters you may have removed.
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