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HP Pavilion 1335uk.Couple of years back on BST 2 GMT changeover the Bios was corrupted. How do I correct this please? Every time I switch on the Date is 01 Jan 2001, everythng else seems to work OK.

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Open your cabinet(box) and replace CMOS battery, then turn on your machine, it would work fine.

Posted on Sep 12, 2009


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After setting to uk time, will revert to European time zone (1 hour ahead of uk)

It sounds like it it changing to BST...
Make sure the date is correct, and set to UST

British Summer Time
Universal Standard Time (GMT)

Apr 17, 2016 | Watches

1 Answer

My hp pavillion dv7 keyboard lock lights keep flashing; at one point the computer didn't want to boot up; I finally got that up today after six months. But the cap lock and the number lock lights still...

those are POST code, error codes, you need to watch time and count them. report them.
leave the battery main out.
does it run ok now? yes/no.? main battery out?.
even new cheap batteries fail easy and hard and short out.
test it with no main battery. it can run on AC power for ever.

are you going to run the COIN cell RTC battery for 10 more years.
it wont make it..
this PC is 10 years old today (can be) so is RTC battery end of life. most fail in 5 to 7 years, says the pink bunny. (and is correct)
the manual shows how to replace it at the real HP Site,
fixya is not hp, not at all.

page 63 shows the way to the RTC

if you power on the PC, and hammer the f10 key]
BIOS runs, its menus;
check the time and date here, if wrong the RTC battery is dead.

read page 3 how.

  • old PC have many points of failure (endless it seems)
  • does the fan run? is it packed in lint, as all are this old.?
  • causing it to overheat?
  • RTC coin cell bad.
  • main battery bad. (just leave it out until the PC runs right again)
  • power pack wires broken, or running real hot.
  • HDD going bad,
  • windows infected?, no OS stated but avoid XP.

HP caps lock POST blink code page is a horror of horrors
no 2008 listing, to name one flaw (2011 and newer sadly)

here is a old post at HP, one guy 3 year ago said

LEDs blink 1 time
CPU not functional
LEDs blink 2 times
BIOS corruption failure (RTC coin cell dead)
LEDs blink 3 times
Module error not functional
LEDs blink 4 times
Graphics controller not functional
LEDs blink 5 times (or RTC dead)
System board
General system board failure
LEDs blink 6 times (or RTC battery dead)
BIOS authentication failure

Feb 15, 2018 | HP Pavilion dv7-1132nr Notebook PC

1 Answer

How do i know if my bios is corrupt

I doubt that you have corrupt BIOS - the BIOS code is held in an EEPROM module which is unlikely to have been altered unless you have suffered some form of electrical failure such as a power surge or lightning strike.

If your computer does not boot nor show the initial boot messages from the BIOS such as memory count, device detection, USB devices or a HP splash screen, then you may have a more fundamental hardware problem.

To reset your BIOS configuration, you could just remove the CMOS battery - usually a CR2032 button cell fitted on the motherboard - for a couple of minutes then refit it again - this will set the BIOS configuration back to default and if the computer does boot, you should get an error message because the Date and Time need to be set again.
Note: make a note of the way the button cell battery is fitted and ensure you put it back in the same way.

Jan 16, 2012 | HP Pavilion Elite M9060N PC Desktop

1 Answer

My HP Pavilion DV seven laptop turns the power off by it self, sometimes and can only get power when I unplugged and plugged back in the battery but date and time is reset to beginning

When the Date and Time gets reset then this indicates the BIOS battery is flat and cannot keep these settings.
Replace the BIOS battery with a new one and then configure the BIOS Date and Time.

Dec 20, 2011 | Computers & Internet

1 Answer

My Asus Eee 1005 netback time, date are wrong when started. Thought it may be cemos battery. This was replaced. Still have problem. Help

Have you verified your time and date settings for your operating system? Please ensure that it is the correct GMT time.
Example, if you live in New York, your time and date should be set to Eastern Standard Time (GMT -5)

Mar 16, 2011 | Computers & Internet

2 Answers

Hp pavilion dv4 laptop is not starting up, when powered and switched on all the lights (Volume, wireless, mute) switch on and caps lock and num lock lights blink twice every 2-3 seconds. what could be the...

first off there is no such thing as a DV4, sorry!!!!
dv4-1000, 1280,1300, right?,. it's 10 old, the battery is that old is no good, the dash matters too if present (details do)
or is it a DV4000, 13 years old not 10 .??? why not post the full model and p/n off your PC service tag so i can show you matching manuals to read and follow, ok?


that is blink code, try to learn how to read them , counts them.
here is a list of tests, simple. to harder.
1; Remove that old big battery 10 years old , it shorted.
2: run on AC power only. in fact can do this forever.......
3: next is the fan working? fan is next and now, does it?
4: flash codes, count them and report them, easy no?
5: the coin cell is next , it is 10 years old that too is END OF LIFE
why not replace it too ,now even if good, to avoid problems later, ?

My answers are for DV4000 only not the DV4-1000 and up vast series of laptops. vast versions of them...
the coin cell , HP name RTC battery, all die at 5-7 years old.
yours is well beyond that. ok?
lets do chapter 5 covering just that now.
here it is, pg 5-20 pdf page 126
we take it it out if lower than 2.9v (a dmm meter is cheap)
we replace it, 3.3 is normal when the fall to 2.9 (think cliff)
they fail fast and the BIOS GOES NUTS,
in fact the PC can be totally dead.
see the manual , if wrong next time tell full service tag data.!!!


that caps lock flashing are codes, learn to count them
my wild guess is it is the code for BIOS NVRAM corruption.
the cure is posted here over 1000 times.
and a million times at real, we are not HP.

Feb 26, 2018 | HP Pavilion dv4000 Notebook

2 Answers

Will laptop work with dead cmos battery?

Yes, but each time you start the computer you have to enter the BIOS to set the proper time and date. This is essential for certain progra,s to run correctly, when the computer shuts off, everything will be reset once more.

Oct 08, 2009 | HP Pavilion dv1000 Notebook

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