Got the arduino ide to upload the "blink" sketch to the pico.
Again using the p400 and there 64bit os.
On my mac 10.12 there are pyton version (use 2 has to be 3) errors while compiling.
Not going to risk messing up my mac with upgrades that might break other programs so stick to using the p400.
One anoying thing is that you have to press the buton on usb-connect to set it to its
program mode each time you try to upload a sketch.
Also deleted any program files that thonny put in its memmory since that appeared also to make the arduino ide refuse to upload.
A new unused pico does not have that issue.
Next tomorrow is to make a image backup of the p400 so i have a return point when i break the os again.

So Far so good..