Hi Andy,
I tried the CF card reader with 3 different CF-cards. The icons were gone after insertion of any of these cards. I monitored the voltage of the mobo: 4,95V stable with or without CF card. The card reader has been connected directly to a Gigabyte UD4P mobo via headerpin. The power supply used is BeQuiet! Dark Pro 650W.
A Memory Stick Duo card via the adapter is not recognised at all (no green lights), but the icons stay present.
The SD-card reader works fine.