HP dv6910 worked fine yesterday; today it will not

Feb 24, today - April 5, hopefully a couple of things have happened;
1) You were able to get a solution and are now, 'cooking on gas' or;
2) Did overcome the temptation to throw the machine out the window electing instead to stick it in the farthest, darkest part of the closet hoping ebay will come through.

Right. In all honesty, i messed up my own mbr a week ago on the DV6910us so no-one to blame but, for the time i could devote to it, see if any of these scenarios works for you:

Can't boot
a. ...from your install DVD
You stick the bloody thing (DVD) in, reboot and all you get is 'disk read error - press CTRL + ALT + Del [Don't bother. Cyclically redundant protocol]

You try 55 million boot order settings in BIOS hoping one shall work - nope.

Gone through that business of removing the battery AND power cable. No activity on the laptop but you religiously press and hold the power button for 45 seconds. {I'm sure this is useful. Don't know the governing dynamics but, just for laughs, do it too.

Hopefully, laptop is still flat-lined. Hopefully because if any of the above worked, i couldn't tell you why they did. We'd be no closer finally isolating what the problem was and how it was fixed.

What worked for me:
Gently (...i was tempted to, never mind) inserted 'Hirens BootCD' I assume any version should do.

Shut the computer down. Boot cold. As soon as it lights up, start [sensibly of course] pressing F11 (identified as system restore) Having no restore image and having deleted the HP partition, it was serendipitous i pressed F11. After a little bit, the laptop shall come to life (remember prior to, keep pressing F11)

The DOS screen out to come up and it shall show you a plethora of tools you can use to fix your system.

Once complete, transfer to ICU, image and backup stagewise as you rebuild.

You can format your operation system. and in boot drive if you have not sufficient space i mean minimum 20 gb then your pc performance become better before.thanks