Phillips GoGear SA5125/37 wont power up

The freezing at 87% suggests hardware malfunction, but you can try all of the "soft" fixes to be sure -

Triple Reset for GoGear:
Disconnect the Go Gear from computer. Press the reset pinhole until the player turns off. Hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard. If this pop-up does not appear, reset the player again WHILE connected to the computer. Open the Philips Device Manager, and go to Repair Tab. Reset the player one more time while connected to computer. Follow the repair instructions.

After repair is complete, upgrade the firmware for this player.

Will erase all the songs, but you should be good to go again.

-Tha Mp3 Doctor

Great... I have the same problem for 6185 and it works now... Thank you