Not booting, stuck on Rose symbol

Hi. I have an RS150 which is stuck on the Rose symbol and is not booting up. I have left it in that state for several hours with nothing but the power lead connected. I have reset the unit using the small button the rear of the unit. Forums have suggested a DC power motherboard fault. Basically I would like it repaired unless someone here can suggest a fix I can do myself. Thanks. Steve.

@BIGSTEVE
Please unplug the power cord, wait for about 1 minute (after discharging), then plug it back in and check.

@BIGSTEVE

If this symptom continues, there is a possibility that the DC power board is defective.
This issue typically occurs when there is a problem with the DC power board of the RS150.
It appears that the DC power board in your RS150 needs to be replaced.