(1) Put the SD Card back into the reader. Never (ever) remove an integrated usb card from an embedded system! This is not a standard flash drive, it is build specifically for that device. It might contain partition tables with arbritrary offsets, startup images and boot loaders in very diffenrent areas of the disc than what a pc might expect.
(2) After putting everything back together, forget that the case can be opened. Unless you are familiar with the usage of a JTAG debugger and have a programming kit for ARM7 processors at hand.
(3) Try the following to perform a hard reset (supposing you did not ruin your internal flash drive):
3.1) release the power slider while holding down the Home button
3.2) push and release the power slider quickly.
If the factory reset is successfully initiated, the LED will turn red.
This works on the kobo touch, so I suppose it will work on Glo as well.