03-10-2019 09:54 AM
Hi, I opened up my Z400 to clean it out, and put new thermal paste on the CPU/heat-sink. However, now it won't start at all, no response to the power button. I had cleaned off the sink/cpu contacts with alchohol swabs, and added paste, cleaned out dust out of the fan and exhaust port.
The charge light is on when I plug it in, but it won't start at all. Is there a way to check if it's truly fried, or if there's some magic CMOS-draining thing or something I need to do to get it started again?
03-11-2019 05:05 AM
As an update, I did the following based on some other threads, no luck:
Same result, no response to the power button, only the charging light comes on when I attach the power cord.
03-16-2019 11:12 AM
One more question on this, one thing that was missing from my earlier post was that I was missing a screw (or possibly both) screws for the fan. Attached is an image of the fan with the screw locations circled in black.
Are these screws conductive, i.e., are they required to complete a circuit that allows the machine to start? If so I likely need new screws fro this, I can't find the originals.
I thought I could get away with only one screw in, but none of the screws match the hole on the left. The fact that that screw hole is borderd by white outline made me think it's important.
Anyway, am I on the right track for this?
03-16-2019 12:11 PM - edited 03-16-2019 12:13 PM
The screws are conductive and ground the fan body. They are not needed to start, and all of them are required to be installed or the unit will not sit straight and it will overheat. You can replace with any screw with the same thread pitch and length. A big hardware stiore might be able to match. Pulling the CMOS battery with the unit unplugged and with the main battery out might reset. Let it sit that way for 10 seconds. Don't do this if you have an unknown BIOS password.