I opened my Extensa 5635ZGto clean up dust. Now it's poweing up for 3 seconds and the shutting down

I opened up my laptop in order to clean up the dust because it was over heating and took the chance to replace the thermal paste as the old one was dried up. I powered up the pc after reassembling it i powered it up and it shut down on tve user login screen, i kept trying thoughout the days and it kept happening. Now when i press the power button it turns on the LED lights but it shuts down two seconds later. Did i miss something when reassembling, is it a problem on the motherboard or is it something else?
Could you leave possible solutions so i can check them out in the morning?
I can also elaborate better later.

Accepted answers

JackE

Hot exhaust and warm case areas are normal depending on CPU usage. A hot exhaust means the CPU is NOT hot --- it's being properly cooled. The heat generated by the CPU is being properly carried away to the exhaust port by its fan like a car radiator fan carries excessive heat away from car's engine. Furthermore, the CPU will throttle or power off if its temperature reaches excessive levels. In these cases where heat is disabling the machine, rather than disassembling it's always best to first try vacuuming the air intake ports and blowing through the exhaust ports a few times to dislodge dust bunnies or other debris that might've accumulated inside.

As for the issue you have now, I suspect an electrical short or similar current leak due to a misaligned screw, pinched ribbon cable or loose connector is tripping a mainboard's circuit breaker. You should immediately stop trying to force the system to turn on --- the circuit breaker may eventually fail and fry the mainboard or a critical component. You need to disassemble the machine again and carefully re-assemble making sure every connection, including the CPU pins, and are properly seated. Then before reassembling the entire case, put the machine on an insulated surface and test if it will stay on.

Jack E/NJ

All comments

JackE

How do you know it was overheating? Jack E/NJ

PsychoticHusky

Thanks for the reply.
The exhaust was letting out really hot air and when i put my hand over the keyboard it was hot. Also the computer was getting real slow.

JackE

Hot exhaust and warm case areas are normal depending on CPU usage. A hot exhaust means the CPU is NOT hot --- it's being properly cooled. The heat generated by the CPU is being properly carried away to the exhaust port by its fan like a car radiator fan carries excessive heat away from car's engine. Furthermore, the CPU will throttle or power off if its temperature reaches excessive levels. In these cases where heat is disabling the machine, rather than disassembling it's always best to first try vacuuming the air intake ports and blowing through the exhaust ports a few times to dislodge dust bunnies or other debris that might've accumulated inside.

As for the issue you have now, I suspect an electrical short or similar current leak due to a misaligned screw, pinched ribbon cable or loose connector is tripping a mainboard's circuit breaker. You should immediately stop trying to force the system to turn on --- the circuit breaker may eventually fail and fry the mainboard or a critical component. You need to disassemble the machine again and carefully re-assemble making sure every connection, including the CPU pins, and are properly seated. Then before reassembling the entire case, put the machine on an insulated surface and test if it will stay on.

Jack E/NJ