I strongly suspect that static electricity zapped our Acer TimelineX 4820T-6645 WIN7 laptop which was working perfectly until the keyboard and touchpad were cleaned. The keyboard AND touchpad no longer work. I can use a wired (and wireless) USB keyboard to operate the F2 key to access the BIOS, but none of the USB keyboard keys work to change the BIOS settings. During bootup I can select "safe mode" or three other modes, but when a mode is selected, a cotinuous beep starts which is accompanied by a recurring clicking sound, and the HDD light flashes with every audible click. The screen displays "loading windows files" but nothing further happens to indicate progress in loading windows. Please guide me in repairing this otherwise great laptop.