# Kernel Problems and Boot and Login Errors Photon OS includes commands to troubleshoot kernel problems and boot and login errors. - [Kernel Overview](kernel-overview.md) - [Boot Process Overview](boot-process-overview.md) - [Blank Screen on Reboot](blank-screen-on-reboot.md) - [Investigating Unexpected Behavior](investigating-strange-behavior.md) - [Investigating the Guest Kernel](investigating-the-guest-kernel.md) - [Kernel Log Replication with VProbes](kernel-log-replication-with-vprobes.md)