" A guy from 'Tech guys' stated that motherboards can fail after any period even 3 months and that there is nothing they can do about it!!".
The PCW tech guy's having a laugh, contact Consumer Direct click here for advice on consumer rights.
Components can and do fail, but some items are classed as being serviceable after the usual 12 month warranty period. And as you have already stated, consumer law suggest up to six years on some items.