Thanks for suggestions premelec.
Trust me; as I get older I become more cautious , which is how I have become older.
However, here are the variables.
A) It was at work.
B) It was a work's device.
C) The no-brand PSU was 6 months old (which is good for Made in Ch).
D) A replacement cost £4.
E) It was a bonded enclosure which would require a hacksaw.
The equation goes like this.
A+B+C+D+E = BER ==> chuck in bin.
"accidental design fault or failure of a good design"
- it was unknown-to-me-brand made in Ch so take your pick , but I would go for "cheaply designed, cheaply made with cheap components. Throw me away I'm dangerous."
For onlookers; "BER" means beyond economic repair.