P870KM1 Won't Boot. Fans Maxed. No Display.

I just got my computer back from having the DC-In replaced and it won't boot, nor will the display turn on.

When I pressed the power button while connected to AC, it lit up like usual, but had fans at full speed for 1 sec then shut off. Does this about 7 times in 2 second intervals. Then it started back up on it's own after a few seconds, but with fans at max speed, only to shut off 10-15 sec later. If I keep the AC connected, it will repeatedly do this process at about 1 min intervals. If I'm not mistaken, the HDD/SSD light was not lit up at all throughout this process.

I tried resetting the CMOS battery by removing AC and battery then taking CMOS out. Reinstalled CMOS>battery>AC after a minute or two then pressed the power button, but it just does the normal sequential lighting outward from the power button and stops booting immediately afterward (no auto-restart with fans or anything).

I also tried doing the EC reset procedure, but the result was the same as the CMOS reset. For some reason, when I was unscrewing the battery for this, the fans would turn on (they were initially off before unscrewing) which has never happened since I bought this laptop two years ago. Not sure if it helps or not, but figured I'd mention it just in case.

Any help is appreciated!

 

Try this,

Unplug system AC
Remove CMOS battery
Press and hold powerbutton for 30s

After this you can reinsert the cmos battery and plug in the ac adapter and power the system on, If everything went right it might bootcycle once before displaying the bios reset prompt.

 

Thanks for the reply, JC, but I've already tried that. I just tried using every config for the GPU's and it still doesn't post.

 

It sounds like the motherboard is damaged.

 

Thanks for the response, Meaker! May I ask what led you to that conclusion, specifically?

 

You could also try and see whether it's one of the hardware components that is faulty.

ie. Try using 1x stick of ram in different slots. And try this for the other hw components.

Sometimes reseating the cpu might even fix this.

 

DC jack replaced and the steps you have taken. Could be PCB layer damage or an SMD device got knocked or a static discharge.

 

Is there any way to manually check motherboard to verify? I just don't have the money to buy a new one and have it turn out to be another one of the major components that needed to be replaced.

 

First you would do a visual inspection then it would turn into an electronics investigation.

Rule 1:
Thou shall check voltages

But also check none of the power circuitry is shorted to ground.

 

Yeah, sounds like something is tripping the safety. Perhaps inspect the solder etc on the replaced and exposed components. Otherwise, if it was done buy a technician, take it back to them