Glad to hear that you resolved the problem with a new AC adapter/power supply/AC converter or whatever else it may be called somewhere.
The nice thing is that you bothered to post the solution to your problem on this forum.
I wonder why it fails to power-up your HP 530, yet works on another laptop?
Was it the AC adapter that the laptop originally came with, or maybe it was for your other laptop and accidentally got switched?
If not, perhaps the other laptop is more tolerant of undervoltage?
TMagic650, you seem to be very knowledgeable about electronics.
Could an AC adapter that is supplying too little voltage to a laptop cause damage to components, as a result?
Do most laptops have something built-in to protect them from this--by failing to allow boot-up, etc.?