When I scan ,refer to device doc to troubleshoot .! light flashes

Is it giving you a message as NO SCAN OPTIONS in the front panel of your All-In-One...?
If yes and if the software is insatlled sucessfully in you computer then try the steps mentioned bellow.
If the software is not installed then you will have to install the software for your All-In-One First.

And If the software is successfully installed in your computer, then you should have a icon in your desktop as HP Solution /HP Director (if not got to Start> All Programs>
HP> HP Solution Center)/HP Director Then try scanning from there, if you are able to scan from there then try the steps bellow.
Open solution center> Settings> Scan settings> Scan to setup> Then in this window click on Restore defaults> Then apply or ok and close all the windows and try to scan from the
All-In-One printer.
If it still does not work then try the bellow steps:
Go to:
My computer>C:windows>system32
Copy hpzipm12
minimize this window
Right click on Start button on the computer>Explore>Programs>Startup>edit>paste
minimize this window.
Go back to My computer>C:>windows>system32
Copy hpzinw12
minimize this window

Right click on Start button on the computer>Explore>Programs>Startup>edit>paste
Now you will see two new files in Startup
Now go to My Computer>C:Program Files>HP>Digital Imaging>bin>
Copy hpqtra08
close this window
Right click on Start button on the computer>Explore>Programs>Startup>edit>paste
Restart the computer
Open Hp Solution Center> Settings>Scan settings and preferences> Scan to button>
check destination list> if available applications are not in the destination list then add them in the front panel destination
Tried to scan.

Good Luck