2000 oldsmobile bravada has no power is this a battery issue or fuse issue or possibly both? The battery is completely dead, no horn, radio or internal lights. No sound when turning key in the ignition and now key can not be removed. Also car will not change gears to neutral for a tow. My hood release also isn't working which is a separate issue, but that means I can't get to the battery to jumpstart the car.

SOURCE: 1993 Oldsmobile Cutlass Ciera won't turn over (crank)

First step is see the Condition of the oil.
Them you need to see if the ENGINE is NOT LOCKED UP.
To Do that, you will need a Rachet and Socket to Try TURN the CRANKSHAFT pulley by Hand.
If you are ABLE to Rotate,
And the Battery is good, Check all the Connection from the BATTERY to the STarter motor,
And the Ground Cable. From battery To the Chassis and the Bolt at the Transmission.

But if you are Unable to TURN over the Crankshaft Pulley.
The Engine is Locked up.
And will need to take a Opinion of a Mechanic .
To be sure Of the problem and the condition that may affect to the ENGINE went damaged.

I hope this help on your problem.

Thank you for use fixya...

SOURCE: 1193? Oldsmobile royal 88 Relay?

How rusty is your vehicle? Been in any collisions?

SOURCE: 2000 Olds Bravada ignition

Okay .. had the EXACT same problem - word for word .. turns out, that my positive battery cable was corrodid badly.. the ignition switch wasnt getting any power or signal - so it didnt know the trans was in park, so it locked the key in place... and all power cut off obviously because no juice was going thru the cable.
Apparently however.. you will get almost the exact same symptoms if the ignition switch burns out... so first test the battery cables themselves.. if they are fine .. then plan on replacing the ignition switch.

SOURCE: car won't start!!!

mine is doing the same... all i did was reconnect the battery...and it worked fine...but know my hood wont open!!! so i cant fix the cable on the battery!!! i pull on the darn cable so hard and the hood still wont budge!!!

SOURCE: car won't start!!! & ABS Light on

Sounds like carbon build up on the contacts inside the electrical ignition switch which is not the key cylinder. Its located on the lower steering coluum if coluum shift or if you have a floor shift it will be inside the console