Acer Aspire V3-471G Laptop cannot boot / start up . HDD indicator lighted up awhile and turned off.

Green8
Green8 Member Posts: 2 New User
edited July 2023 in 2018 Archives
Hello.
Im using Acer Aspire V3-471G laptop.
Previously there was loud noise from the fan, system is very slow, after removing dust still the same, so I have changed a new fan which eventually things get better.
I had also removed and applied thermal paste as suggested at needed areas since I had dismantled the laptop.

Some of my keyboard's keys stop working. 
I still managed to use the PC for sometimes.
I tried to dismantle and install the keyboard again incase some parts not fix properly.

At some point the PC cannot boot up. Only 1 power LED is lighted up. The HDD indicator lighted few seconds and turned off. Monitor display is blank.
I tried to dismantle almost everything and install back properly multiple times within few days but still don't work.
I used another laptop's hard disk but still dont work.
I thought the laptop has died and eventually just curiously pressed those 2 white small circle buttons on the motherboard.  I think sw5 and sw6.
Suddenly the laptop can boot up and use as usual!

I decided to PC reset the computer for the system to be faster and remove possible viruses thinking it may affect the keyboard as well.
After few hours reset, everything is faster but some keys still don't work.
I can continue to use the laptop, faster than usual for many many days just that some keys don't work.

Finally my new keyboard has arrived. I dismantled the computer and change the keyboard.
The laptop cannot boot up again!!! This time round I tried to press the sw5 and sw6 buttons again but no miracle like previously!
I also tried many times to hold down the power button for many seconds to discharge electricity as suggested but still dont work. 
I already took out the laptop battery for many years and just use adapter.

During these blackout, sometimes I pressed the power button down for few seconds to force shutdown and I can hear beep sound , sometimes cannot.
Sometimes I just switch off the adapter power and I can hear beep sound just before everything turns off completely, sometimes cannot hear the beep too (weird).

I do not know what to do now!
 Help!