The microwave and the Display are not working whats wrong

To cook with microwave only, press "Microwave/Grill/Combi", once, the screen will display "P100". Press "Microwave/Grill/Combi" to select the power level. Then press "Start/+30Sec./Confirm" to confirm and turn the dial to set cooking time. Then press "Start/+30Sec./Confirm" to start cooking on microwave only.

To switch to microwave/ grill combination cooking, choose C1 or C2 when selecting the power level.

See page 14 and 15 in the user manual.

Unsure from your question which model microwave oven it is.

Example of a free manual:

https://www.manualslib.com/manual/302833/Oster-Omw1199.html?page=8

Oster OMW1199 Owner Manual Microwave Cooking Grill Combination 1...

NN-ct559w set on combi micro/ grill function , micro low , grill 1 but grill didnt come one, tried grill on own again no grill . Can thiis be repaired?

The magnetron is the likely problem, {heart of the microwave oven}

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Go back to the dealer and insist that he give you your manual!

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

heatman101.,/,/

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
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Door glass broken on russel hobbs 28lt micro wave. Any idea where I can have this replaced. thank you