cl-Albert wrote:
Welcome to the forums and sorry that it couldn't be under better circumstances.

Anyway, ASUS doesn't expect (or allow?) customers to repair their own units, so technical documentation or even parts like a motherboard for the G20 will probably not be available from the ASUS end, but you may want to look into it more just in case I'm wrong.

If you want to send in the unit though, you can contact ASUS support through the page below to request the RMA number which can probably be arranged through email or chat as well through a different page.

http://www.asus.com/support/CallUs

Although I haven't taken apart a G20 system myself, if you didn't do anything too crazy (or zap anything with static?), expect the motherboard should still be okay and wonder if you do want to try re-seating cables, memory, video card connections, etc. if you haven't already. Others might have more ideas if you want to wait longer for a reply.

Not sure how much this can help, but try to slowly tilt the system to and fro just to make sure isn't anything loose inside.
Haven't really looked much into this myself, but if you search the forums, G20AJ customers report there are jumpers that need to be set when using an extra AC adapter, so wonder if possibly those were moved or changed at all during the process, otherwise, would probably avoid touching them and check other things instead if they look okay.

Anyway, hope this helps and you can get that system up and running again soon.

The Conscript wrote:
Hey, good news: You are not alone. I have the EXACT same symptoms. Everything else is thebad news.

Just like any other day, power on the rig (G20AJ), do my thing. Before I go to sleep I turn the computer off. The next morning is hell. I press the power button, all the LED lighting is fine, the CPU and GPU fan run, but it's continuous to no end. There is no video signal from the onboard HDMI port. No POST, thus I cannot access windows nor BIOS.

My intuition tells me the motherboard is where the fault lies also. This theory comes independently from yours. I made an earlier thread days before you, titled 'what type of motherboard is in the G20AJ'. I ask what other motherboards may fit into the G20AJ', if any. At the request of another user, I mention my reason for taking apart my rig completely (I included an image of the motherboard I had taken out), my motherboard seemed to be faulting.

My prognosis/thinking is this: The CPU and GPU fans both run. And the lighting turns on. Power should not be an issue, as power is supplied (although I acknowledge I don't know if it's enough). The GPU does not need to be considered as the fault, because it is not required for a computer to attempt a POST. My RAM sticks are relatively new and are credible(16gb 2 year warranty hyperx fury). OEM SSHD, no reason to fail on me, no whiring, clacking nor abnormal behaviour, nor any unusual stress has been placed on the SSHD. The CMOS battery is not needed for POST. CPU, I've never had one fault on me ever, I would like to think it's fine, heck I'd say the CPU is one of the most durable parts. I've tried alot, resetting CMOS, draining CMOS overnight, etc etc. All this leads me to conclude that the motherboard is bad. We all know the motherboard is a sensitive sob!!! And it is cold winter where I am.

Good news if you wait: I've ordered a new motherboard from eBay, along with a new SSHD just incase (1TB was always limiting anyway). Perhaps I can resolve my issie by replacing what I presume is a faulty component and verify my conclusion. And I will share my results if I remember/there is interest. I may also record a video of how to rip the thing apart and reassemble.