New
#11
If you're still under warranty I'd use my HP one-year tech support to get help with this.
If you're not under warranty, HP will still sometimes answer your question via chat or email.
You've really done all you can here, putting your model number in the title to catch someone's attention who might have the answer, posting in General which gets most traffic. Let's hope someone who has resolved this issue stops by. Have you posted in HP's forum as well?
Meanwhile you can extract from the HP Recovery Disks each of the factory programs and utilities, so if you can find out which one lights the LED's you're missing maybe that is a possibility: Extract HP 3rd Party Software from RecovCD