My 1998 S40 has an intermittant fault on it's ignition. When you turn the key nothing happens no lights on dash etc but anhting before ignotion eg. electric windoes work perfectly. But sometimes it starts. Yesterday it died whilst driving ignition lights came on and then off and everything died, even the steering lock went on (scary). The electronic specialist garage have changed the ignition swtich but it still keeps happening, they now don't know what to do. Dealers only suggestion was to change ignition switch. Any suggestions would be gratefully recevied.