Yesterday I opened my machine to dust and clean it. Was extra careful with it. After re-assembling it and booting it, I got a "cpu fan error sceeen". So I tried moving the CPU fan around, getting it to a new position, and now I'm not getting any signal input from my computer at all. I've already tried moving almost every piece around, unplugging all the unnecessary stuff, but still no result. Would appreciate some help with this as it's the weekend, aka my only moment of rest of the week.
Maybe you messed with the fan when cleaning which caused it to spin slower and thus not hit the threshold the CPU needs on bootup? YOu could try fixing that with BIOS or making sure the fan still spins smoothly and has power.
As a last resort you can also try removing the CMOS battery for 10 seconds and rebooting with it placed back in.
This is my guess.. The fan either got unplugged or de-dusting it killed it - which is not uncommon.
I made sure to block the fan when dusting it so as not to give it excessive torque. It spins afaik