Oh i like your "Please take a look at those threads before you start a new one" suggestions - very quick. However, no answer for me i'm afraid so perhaps someone can help. I have a 6730b hp laptop that won't even get as far as POST. I press the power button, the lights come on, but the only thing that then happens is the HDD light pulses about every 3 seconds. Try as i might i can't find support from HPs website on this. My initial thought was RAM so i bought some more from crucial but upon removing the stick that was already in the laptop (under kb) and replacing it with the new one it made no difference - tried different slots also. I have since found that memory errors are shown with flashing caps and num lock lights so that's not my problem. I can only think it's the m/b as i get nothing on the screen, no boot, no nothing, just this damn flashing light. I took out the hdd expecting that if it was this, then at least i'd get to POST where the laptop would complain about no boot device, but the symptoms remain unchanged - just flashing hdd led every few seconds. So i can't find what this error code means (thanks HP) and also on their website there is no doc i can find on how to replace the m/b, however i found a good generic link here :- http://www.ehow.com/how_5049933_replace-hp-laptop-motherboard.html Does anyone have any advice please on anything else i can try? I've had the battery out, powered just off mains; battery out and power putton pressed for at least 30 seconds prior to adding mains power again; neither of which helped. Or even if anyone knows where the HP tech doc is (surely they've got one for their technicians?) on how to replace the m/b? I've seen a few mobos on ebay for sale - just a pain in the backside if this is the only option left? Cheers.