Going back to my PC I used the same arrangement, instead of struggling awkwardly at the back, and plugged into a USB port at the front where I ususally plug in my printer, which works from there OK.
When the PC is booted up, the mouse light and Num Lock and Caps light all flash as ususal but otherwise are completely dead. I then unhook that and replace the mouse and keyboard in their proper PS2 ports in the back but again they are dead. The only thing I can do then is reboot using the button on the front of my tower and then all is OK when restarted.
What can explain this anomaly and how would I get the mouse and keyboard working from that front USB port?
Grateful for any advice.