Computer panel is frozen, where is the reset button?

You need a special screwdriver to get those star shaped screws out. I would suggest going to a hardware store or their website and look for "Tamper-proof Torx" screwdrivers or bits. You are probable going to need either a #15 or a #20 bit to get those screws out. Normally there are no screws on the bottom that hold the side cover on unless they are actually on the side of the microwave. The front is held on by clips mounted on the cover itself, so you need to make sure you catch them when you put the cover back on. Good Luck!

Remove the screws on the back of the cover. There might also be some on the sides. The cover should slide backward and/or upward after the screws are removed.

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One of the most common problems like the one you're having & is an inexpensive option to replace is the door switch, replace it and see if that helps. Should be about $10.00. If that doesn't fix your problem, buy a new micro for about $50.00

The problem is in the magnetron or the inverter board if under 7 years old. Cost to repair will be equal if not more than a new microwave oven.

You likely have a sticking door switch or damaged door switch mount, or possibly a sticking relay on your control circuit board.

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"F4" on a GE is normally a defective humidity sensor.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

See these files for disassembly help:
http://wwww.microwavedisplay.com/safety.txt
http://wwww.microwavedisplay.com/disassembly.txt

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

call the certified technician to fix the said problem may something is loose during startup of the machine.

In there models, the cavity light is located in the magnetron cooling duct on the right side of the chassis.

You need to remove the outer cover to access it. See this file and this file for disassembly help.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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Do Not Use The Microwave. If You Need Parts Try Finding A Part Number And Use Ge To Order Parts. Click Here To Order Parts