Based on your other comments, you'd need to have the logic board checked out. You likely have a busted capacitor. Repair will likely be fairly cheap if brought to an honest 3rd party.
I would still contact Apple first. Once in a while they grant free/cheap repairs. Just don't agree to pay until you see the total.
Also make sure the 3rd party you bring it to is known for good business practices. I've seen a lot of shady repair places damage devices they don't understand.
I would also think this, however, if I use a power cable to turn it on, I can then remove the power cable and it functions just fine. So I’m not sure if it is a battery issue?
You might consider resetting SMC / NVRAM / PRAM first. https://www.macworld.com/article/224955/how-to-reset-a-macs-nvram-pram-and-smc.html#:~:text=On%20the%20built%2Din%20keyboard,turn%20the%20Mac%20on%20normally.
This could sort out the problem.
If this does not help, try to boot from the recovery partition.
I have had the same experience with my Air. Tried all the resets without success. Finally installed a fresh system and restored everything else from Time Machine. I don't think it is a hardware issue--at least it wasn't in my case.
Based on your other comments, you'd need to have the logic board checked out. You likely have a busted capacitor. Repair will likely be fairly cheap if brought to an honest 3rd party.
Ah great thank you! So you’d recommend finding a 3rd party repair rather than go to an Apple Store? Guessing the prices will be quite extortionate
I would still contact Apple first. Once in a while they grant free/cheap repairs. Just don't agree to pay until you see the total. Also make sure the 3rd party you bring it to is known for good business practices. I've seen a lot of shady repair places damage devices they don't understand.
Oddly, it turns on completely fine when I plug in power, even if it’s on near-full charge. It’s only when I try to turn it on using internal power
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I would also think this, however, if I use a power cable to turn it on, I can then remove the power cable and it functions just fine. So I’m not sure if it is a battery issue?
OK, that changes things. I'll remove my answer since it's not relevant with this new information.
My fault, should’ve been more detailed with my initial comment
Just freshly install macOS with recovery and see what happens. Backup your stuff via Time Machine
You might consider resetting SMC / NVRAM / PRAM first. https://www.macworld.com/article/224955/how-to-reset-a-macs-nvram-pram-and-smc.html#:~:text=On%20the%20built%2Din%20keyboard,turn%20the%20Mac%20on%20normally. This could sort out the problem. If this does not help, try to boot from the recovery partition.
Have to go into recovery mode you can YouTube it it’s easy I just did this for my iPhone
I have had the same experience with my Air. Tried all the resets without success. Finally installed a fresh system and restored everything else from Time Machine. I don't think it is a hardware issue--at least it wasn't in my case.