4750G Stuck on Boot Splash Screen.

Hi Guys,

I'm having a problem on my notebook while I was upgrading to Windows 10. During upgrade it was installing fine but it wasn't able to boot back into windows as it was first stuck on windws 10 loading screen and it was stuck there for an hour so I turned it off and it show reverting back to old windows but ti was stuck there again so I turned it off and it was no longer able to get pass the bios acer splash screen and it will not load anymore. I thought it was a hard drive but it is not.



Not working:
- Bios loading bar at the bottom show loading up to 75% of the bar but stops there
- Connot enter bios menu even so. No F2 t let me enter setup. I guess coz stuck on 75% loading.
- I cannot see post messages since it's seems always hidden unless set inside the bios.

Here's what I already did:
- I have removed everything down to the just the notebook motherboard w/ mem along + screen + power switch. No other component attached to the board(like hdd, bluetooth, speeker, usb/port, network card)
- Reset CMOS I removed the battery, not using a battery when troubleshooting.
- Reseated the cpu and cleaned heatsink/chips w/ repaste(I just did since I'm running out of ideas)
- swapped the ram modules to different slots and used a new memory module from my other notebook

Even though I did all that above still the same problem. Stuck on Acer logo bios splash screen.

Working:
- Even though it's stuck on bios acer splash screen FN + brightness works, including the other FN functions like keyboard off, display on off etc....
- Ctrl + Alt + Del works even thought it's stuck



Well sometimes I'm thinking that Windows 10 upgrade destroyed my laptop or I guess it was pure coincidence. I'm wondering what's the problem here to be honest. Bios corrupted? Not really, it's impossible windows upgrade can do that since slash and fn keys are still working. CPU/Mem problem? But's it's booting just stuck.
Was perfectly working without any probs or overheating problems since I often clean it every 5-6 months and use IC diamond for the past 4yrs.

Any laptop technician opinion here is gladly appreciated

 

try to find your latest bios version, use "crisis disk" to make an authomatic bios rom flasher and follow the steps of acer to reflash your bios. Generally is press Fn + Esc key and then without leaving the keys, plug the psu. Power light will blink one or twice, then press power buttom without leaving fn+esc and it will turn on with the fan at full speed. It'll take a few minutes. Be calm, turn it off after 5 minutes if the lap doesn't turn off by itself
Turn it on again and if you understand my english and you did the things right u'll recover your laptop

 

I've tried actually.

hold fn + esc, plugin then hit power while keeping fn+esc. It turns on with goes black screen/no display, flashdrive blinks few lights, power on leds then nothing happens. It stays black screen, it doesn't restart either or blinks the other leds. I've hold the key for 4-5mins but nothing happens but noticing anymore light from the flashdrive.... only flashes once at first tick on the power button no activity sign after that.