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Most of distros can't boot Manjaro. You have to restore grub-loader of [Manjaro](https://wiki.manjaro.org/index.php?title=GRUB/Restore_the_GRUB_Bootloader). And, when installing multiple linux OS always install Manjaro last. 

```bash
mount /dev/sdyC /mnt
mount /dev/sdyB /mnt/boot
mount /dev/sdyA /mnt/boot/efi
manjaro-chroot /mnt /bin/bash
manjaro-chroot -a
```

<h3>Reinstall GRUB</h3>
```bash
pacman -Syu grub
```
<h2>BIOS System</h2>

```bash
grub-install --force --target=i386-pc --recheck --boot-directory=/boot /dev/sdy
grub-mkconfig -o /boot/grub/grub.cfg
```

<h3>Reinstall GRUB</h3>

```bash
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck
grub-mkconfig -o /boot/grub/grub.cfg
exit
sudo reboot now
```


If it doesn't work than, you have to reinstall manjaro again..