<!-- from fixya rte -->Replace internal batery Presario cq62 - Compaq Presario Notebook

Try this link.

www8 hp com

see the video attached. and proceed according. God bless you

Here's a link to the Manual for your unit. Looks like these units are full of bugs, since many people are having problems with them. Good luck
Compaq Presario CQ62 219WM Notebook PC User guides

We had this problem several times, even sent it back for service when it was under service plan. It was fine on arrival for service. The "non-techie" solution we came up with... pop the battery... the key series in the book doesn't work, hard reboot doesn't work...unplug doesn't work... the only thing they did during the shipping process was removed the battery so we tried that and it seems to work every time.

The CMOS cell is located on the motherboard; however the process of getting to the area is difficult. One small mistake and the entire computer is finished. Best a Professional who has the technical skills to open the case and get to the internal parts could save the day. If the computer is old, the cost is far too great to get professional assistance. If you still feel you are comfortable disassembling the computer, go to HP.Com and locate the computer, get the service manual and follow the directions from there.

old PC,, Cq series. cq62-nnnnn you left off the nnnnnn
cq62-100, 200 ,300 what?
running mS windows 8
HP does not support W8 on this PC so that means you are on your own steam... (you , it and microsoft 100%)
forget ACER this is not and ACER PC< at all, (totally different)

you could reload w8 , like you did before, now all that works
its login password issue,
can i presume the screens look ok W8login screens?
local login fails, not bios, and not windows live logins fails
that is right there are 3 tiers of logins.
admin , create a new account and use that
or do that and ask at MS how to copy date from dead account to new account, you never said once you had data.
if no data on pc, then reload 8, easy no?
the newer the OS the more hard it is to get data from that dead account( new permission rules, and hard to do) ask

best i can tell, lacking your full model number
teh CQ62-400 (newest) had only Windows 7
so how did w8 get there,
from whome, and what media.
and what install methods.
from MS CD? or MS ISO, or from ebay hackers disks/
what?

here are the ways, (not data recovery)

http://www.pcdied.com/passwords.html

Hook a external keyboard to make sure it is working, if yes! the laptop keyboard will need to be replaced.

Please re install your on board graphics driver ( VGA driver ).

Please go to the manufacturer site for latest driver.

Hope this will solve your problem.

Here is a link to the lowest priced one I was able to find on eBay:

http://cgi.ebay.com/A-NEW-COMPAQ-PRESARIO-CQ62-15-6-WXGA-BV-LED-SCREEN-/180565663257?pt=LH_DefaultDomain_0&hash=item2a0a8d5e19