Re: HP dm4 no sign of power
Well with the battery in, you should see and orange charge light next to the power port, With the battery out, or charged it should be white.
The two led's on the left side, one towards the front of the laptop is the power on light, the second light on the left towards the rear is the hard drive activity light. (are one of those lights blinking?)
They only option I can suggest to you is to pop a known good stick of memory back into the laptop, remove the hard drive, optical drive and reset the bios by removing the battery for several minutes. do a hard reset as described in the link in post #11.
If that fails the try to connect a usb keyboard and separate monitor, just to see if it can post.
I'm out of any other options unless someone else has another idea/method.
At worse, the motherboards are cheap, I only paid $40. for a replacement dm4 motherboard I have (had a one blink flash on the caps lock key)
I don't know half of you half as well as I should like, and I like less than half of you as well as you deserve