Oh, I searched before posting.
I had the backlight problem - searching revealed this to be caused by a bad video driver choice - it switches off as instructed now.
The hard drive is a different issue.
I have APM enabled in the bios, and the hard drive set to power down after 1 minute. It does so in DOS quite happily, but Windows 98 seems to be keeping it spinning.
The option for 'hard drive' under control panel/power is missing, which confuses me - Win98 overrides most power management options in the bios anyhow.
I'm thinking it's either a bios setting that I haven't noticed (or maybe I need to disable power saving in the bios) - or an updated driver may help - or an updated bios.
Do other I-Opener win/98 users have the hard drive listed under 'power' ? I assume so - if so, are they running the version 1 bios, or is there an update? (I searched for this also, but couldn't find anything definitive)