Be confident to solve this issue without a screwdriver. It is not unusual for the PB 1400 after beeing unused for a longer period. It might be helpful to discharge the PB completely by removing the battery from the battery bay, unplugging of the AC power adaptor and depressing the start button for several hours (over night). When attempting to power the machine up afterwards, try to start without the battery. If this attempt was successful, shut down the machine and insert the battery to let it take charge for some hours. In case the battery is dead use the computer w/o battery or cover the battery contacts with some electric insulating tape. Unfortunately new batteries for the PB 1400 are pretty expensive.

Once I have seen a PB 1400 battery pictured with a label saying "Li Ion technology". In case someone has to share experience with Lithium Ion rechargeable batteries in combination with a PB 1400 I would be glad to read about this.