Starting problem 1999 nissan sentra 4cyl. 5 sp. manual transmission.depress clutch turn key to start but nothing happens except gauges light up but starter won't even click. new battery and starter checked out o.k.

the transmission linkage must not be putting car in neutral. depress the clutch and see if it will roll. that accomplished will rule out brakes dragging. neutral safety switch not satisfied therefore no start.

this could be a problem in the power distribution box under the bonnet like a corroded cable or the vibration has broken it ,disconnect the battery and put it on charge overnight and see what happens in case the battery is just flat ,if still nothing after charging try a jump start in case it is the batery died as they can go all of a sudden .

That cylinder is known as the clutch slave cylinder. It should push against the clutch fork every time the clutch pedal is depressed to allow gear changes. If it doesn't, suspect a faulty slave cylinder, or clutch master cylinder.

Since you have power to your accessories, here are a few more things to consider:
1: Automatic transmission not in park or the neutral safety switch is faulty
2: On manual transmissions clutch pedal not depressed or or clutch start switch failure
3: Broken or loose wires in the starting circuit. Inspect all wires and connectors at the battery, starter solenoid, and ignition switch
4: Starter motor pinion jammed in flywheel ring gear. Manual transmission. place transmission in gear and rock the vehicle to manually turn the engine. Remove starter and inspect pinion and flywheel

Hello if you fell your clutch is going out that is probably why fith gear is not working. Clutch can be fixed at your local mechanic if it is the clutch transmission would not need any attention as being replaced.

Connect a voltmeter to the middle pin of the startermotor. Let some start the car, if voltage appears and no start it's likely the starter motor / solenoid.If no voltage appears it might be the clutch / brake switch. If there's a cruise control - these 2 switches are read also when cruising.

check crank sensor

Could be bad battery or Somthing going on with the main fuse box.  Another thing to check is your ground wires.  If they are loose, you can not complete the circut.

is it a manual or automatic?if it's manual check clutch.if it is automatic check transmission fluid.

burn it!!!!!!