Laptop turns on and off repeatedly after disassembly

[SI999]

Hello, I have recently decided to dissasemble my PC to clean all the dust that was inside. After assembling everything back, I decided to check if everything is okay and it turned out that my computer turns on for approx 2 seconds, then shuts down and does the same thing repeatedly. I have tried several things:

1. Press the power button for 1 minute with removed battery and charger

2. Insert RAM to other slot

3. Try to boot up only with a screen connected (no hard, no RAMS, etc.)

4. Checked all the connections, wires, etc. 

The only thing which changed something was removing RAM’s, because computer turned on for around 15-20 seconds (instead of 2) and then turned off repeatedly. The screen doesn’t show any signs of working as well, even the backlight doesnt work. What else can I try to do? Is it the motherboard fault?

[pepe999]

Hi,

What exactly was disassembled? Have you used the antistatic mat or wrist strap? We need more information. 

[SI999]

Hello, thanks for your reply.

I was using wrist strap. Before realizing the issue, I have removed the keyboard, fan and the battery. Motherboard, RAM’s and hard drive remained untouched initially.