"defective iPhone replacement approved then declinedL my iPhone 16 pro suddenly blacked out and won't turn on. It's a hardware issue. [...]What should I do? How can I contact apple singapore?"
-------
Troubleshooting a Black iPhone Screen:
I'd say the iPhone is stuck in a boot loop. This cn occur when you go about installing an updates, and it stalled while in the process. Use my User Tip: How to Fix an iPhone in a Boot Loop - User Tip
Finding Out WHY this was cCancelled...
A. Call Apple:
If you can call Apple, then use another iPhone, and screenshare with the Apple Rep, hovering over the iPhone while on speakerphone. This is allow the Apple Rep to see this firsthand, from your perspective. Use my User Tip Screenshare your iPhone with the Camera App Enabled to Easily Converse Over-the-Phone with Apple Support - User Tip
or...
B. Set Up the Chat Session:
If calling is not an option for you, then try performing a chat session with Apple on your Mac.
- Go to: support.apple.com
- Scroll Down to "Tell us how we can help"
- Select: Get Support
- Proceed from there as Necessary
