Dell Studio 1535 - Sound Button Lights Flashing - Computer won't start

Hi guys,

I'm new to the forum and have had the below issue for about a week now.

I've been looking for solutions in this forum and online but nothing worked or matched the symptoms.

Symptoms are :

The computer when powered up does not start,

Screen remains black,

Touch sounds buttons mute and raise volume blink in unison,

Lower sound button remain on,

This is for a Dell Studio 1535 I have had for 7 years. Running windows 8 for 4/5 months now.

I have tried : A solution by Krypebud posted here 6 years ago : which was to download the firmware ISO I and reboot the computer. This did not work.

I have also checked that the screen does not work on a second monitor : it does not.

Additionally I have tried the LCD BIST test which works fine, no distortions, colours all seem fine.

Would anyone know needs to be done here ? (apart from buying a new laptop)

Please be simple in your explanations I have very little knowledge of computers, assume I have no idea about anything.

Thanks in advance for your help,

Greg