There is no sound on y laptop. all systems show volume is on full but no sound. was okay last night model 6735s HP laptop

you need a new hard drive, the one in there now is almost done.

It should last as long,as it would have,without the panel damage.

i lost my password

NO OS stated ?Operating system" we cant never ever guess that.
remove the battery , test the PC with no battery?
does it run perfectly now ? yes/no.
if yes and not with battery then the battery is bad or not charged.
this is step 1. of a long process.... PCs are complex
I can not understand your post at all. (cept its power issue)
the full PCs model was not stated,
Is this LT mobile? or always on a desk.
I cant just know how you use a laptop ever.
on desk or in an airplane or at STARBUCK's is 3 different usages.
on a desk? Ill answer, the others are vastly more complex !
DESK bound 110 LT:

1. turn off sleep and hibernate modes (CP + power settings)
2. turn on , the same page, "laptop power button turns off PC":
3. make sure the your software is from HP at your HP support page, we are NOT HP. here.
4. keep the battery out, of the pc, charge it and park it so when need it not bad or dead. leave it out. run on AC power only.
5. my wild guess is PC goes to sleep and sucks the battery dry as all do eventually or all do on weak /bad batteries. keep the AC power pack plugged in to wall power all the time. hint hint.

this PC is a very old COMPAQ
HP does not support this now, it's too old (why not upgrade)?
so to fix it , takes tedious steps.
my post above begins this process....


the one thing I cant unstand is this.
plug off? (what? is this)

If there is a display switch in the functions on the keyboard (most likely will look like a laptop monitor or a computer monitor on the keyboard). Press the function key and the button associated with that and wait 3 to 4 seconds (you may have to press it multiple times) If you have anything in the vga slot, then it may think a monitor is plugged in and won't display the laptop screen.
If none of the above work, then maybe your computer is having a systematic failure, or the screen connector is loose.

You won't be able to do it yourself. You'll have to contact an authorized HP support center.

There used to be "easy" ways but now the password is stored on a chip on the motherboard.

Can you see the boot up CMOS display with HP Logo? If so plug a USB external keyboard and press F11 while boot up process. Then it will prompt for Recovery loading.

Have you tried another power cord? If you try another power cord, and it still does the same thing, then I think your laptop is having a power problem. You need to take is to a technician to fix the problem for you.

Best wishes.

Have you tried to start in fail safe mode? try push f8 before vista screen and after bios screen. choose safemode. does it start ?

Was there a reason why the BIOS was updated? If it was working fine before you updated the BIOS.. then I would reboot the system in safe mode(F8) and see if you can do a system restore