Ps3 super slim, very slow power up and sound problem

Hi all

I have a customers Ps3 for repair and

its giving me problems,

It takes long to switch on, about 1min 30sec after I press power on I can hear activity on the blu-ray drive,a few seconds later it switches on.

Secondly,using AVcables i have picture but no sound at all

Using HDMI cable I get no picture or sound at all,

I have tried pressing and holding power button,the led goes green and a beep,it takes quite a while before I get the second beep,I don't get 3rd beep

It's the ps3 (CECH-4303A)

Please advise

Regards

Chris