@DeepDayze:
Thank you for replying.
I'm still burning using k3b; always careful to verify MD5.
I've just burned another copy of siduction-12.2.0-ridersonthestorm-kde-amd64-201212092131.iso
And I was extra careful: verify MD5, DAO-8x speed.
Booted, the dvd appears to have run up; but displays only garbage.
On doing a check sum on the burned disk: I found no way to get k3b to cough that up. I'd be grateful for advice on how to accomplish that.
Since the only live disk that will open and display properly is a (latest aptosid) 32-bit, this question:
The cpu being 64-bit, does it need instruction from BIOS, or perhaps a switch on the mobo, to operate @ 32-bit?
I'm thinking that 32-bit may be set (in BIOS or mobo), explaining why the only live disk that will boot is a 32-bit.
@convbsd:
Thank you for replying. I don't do usb-sticks ... yet. But soon, I think: using one to flash this Lenovo BIOS.
I'll file your helpful suggestion, just for now, with thanks.
grady