Note: this information does not apply to the TetherBox (2 and 5 channel) which does not have a BIOS, this only applies to the TetherBox Pico, Giga and Pro.

When your BIOS settings are reset, you may experience one of these symptoms:

  • The unit will not automatically power up when plugging in a power cable.

  • You may see a "Press F1 to Continue" message when plugging in a monitor.

  • You may see a message like: "insert boot media" or "cannot find a required map", for example:

Why does this happen?

There are 2 main reasons why this could suddenly happen:

  1. Dead CMOS battery - the CR2032 Button battery inside of the unit has gone flat and needs to be replaced.

    Note: These batteries last anywhere from 3 to 7 years depending on use. These batteries are used to preserve the unit settings when unplugged from mains power. Consequently, prolonged unused storage can cause these batteries to deplete quicker.

  2. Power Issues - If there were frequent and close together power cuts or power surges, this could cause the unit configuration to be reset.

What do I do to resolve the problem?

  1. Try to configure the BIOS again by following these guides:

    1. Automatic Power-cut Recovery

    2. How to fix a boot device?

  2. After the unit booted up, power off the unit.

  3. Unplug the power cable for 5 seconds and plug it back in.

  4. Did the unit automatically power back up? - if so, great! if no:

  5. If the unit did not power back up, this means the CMOS battery on the unit is dead and needs to be replaced.

CMOS Battery Replacement

If the above steps did not help resolve your problem, the issue is a dead CMOS battery. You should be able to find replacement batteries in most stores that sell watch or other button cell batteries. If in doubt, please contact us on support.

Note: On some units, the battery may be on the underside of the motherboard.

Did this answer your question?