Can't go back to mac OS

Bonjour,
Can somebody help me to go back to mac OS ?
When i open my computer in anyway i have windows XP ; I can't boot to mac OS;
Before this day i could pass to one système to another without problèmes.
I use bootcamp and macOS (tiger) open first by défault with the computer .
tank you véry much

Bonjour abdel,
When you boot up hold down the alt/option key - on a wired keyboard - you will then be able to choose your boot drive, pick your OSX boot disc.
Don't forget to change the startup disc to OSX in the system preferences after though! I would have mentioned going to Windows and opening the Startup Disk control panel method but I don't have this option in my boot camp drive so figured you may not either?
As a thought, I use XP but with Parallels software, Fusion is also good then you don't have to reboot each time.
Regards
B

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