How can I find the blue screen of death log? On booting I get a BSOD and
then an instant re-boot (via the screen offering safe mode) which come sup
okay.

This double booting seems to wipe any log files to show what's happening.
There is nothing created the same day with the extension DMP.

Event Viewer shows Event-ID 26 which suggests a machine check from an
application but there's no further info.

Where can I find other relevant logs, especially amything that shows the
actual BSOD error code or which points to a failing bootup application?