When the power ON is keyed, the battery charging LED flashes (Even when not connected to mains power) and turns off after few seconds. I've checked the battery, it shows full charge. The laptop was working fine, and was switched off normally the last time. Removing the battery out and re-trying to switch-ON using mains power gives the same result. Request for urgent help and advice from all who have encountered a similar problem.
Had the same problem with My Compaq M700 No Boot Or Post. Battery Light Flashes 8 Times, Have to Wait 24 to 48 hrs sometimes longer to get Laptop to Start. Tryed the DC Converter Board Change No Difference same Problem. Noticed When Laptop Did Start Clock Time Was always a Little Off 2-4 Hours sometimes more. So Figure CMOS Problem With Time Issues. Read About Battery Memory Transitor Voltage spike Detection Issues Corrected With Newer Bios Flash at HP Supports. So I Flashed Bios With Latest 686h. During the First Boot After Reflash Battery LED Did flash No Start, After pushing the power button again it Started. And has Every since.So Far Laptop Now Boots Everytime and CMOS Checksum Seems To Keep Time Correct In Windows. The Bios Flash Corrects a Voltage Spike Detecting Transistor In The Charging Circuit. During First Start after flash Bios will run system test on the charging system and Correct CMOS. Worked for Me Hope this Helps a Few.
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I have the same prob
Further to my post of December 20th. I bought a 'for spares M700' which had a working motherboard and display.
From this I was able to isolate the problem to the dc-dc converter board - a well knpwn weak point.
I have seen posts that say that replacing the dc-dc conveter board did not solve it. I can only think the replacement was faulty too.
Hope this helps a few people with the 8 flashes fault.
Replace the power plug. Often the solder joints become bad on these models.
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battery light blinks.even when the power supply is plugged in.but wont power on i have tryed it with the bat in and out .but all i get is the bat light blinking.the bat is showing a full charge. could it be the charging circuite !
I have the exact same problem, but I don't think it's the power plug because it won't work in the docking station either.
mine got same prob it was on before but now. i try everythin it wont switch on, no lights no signals jus wont go on :(
Have had this problem for 6 months. If you take out the battery and wait 24-48hrs, then plug in the mains adapter, it will start almost every time. Shutdown and try to restart, it will just flash the charge light 8 times. Wait another couple of days, its OK again. I have taken out the CMOS battery, has no effect ( apart from a CMOS checksum error). Put in a charged main battery after waiting 48hrs, it starts OK from the battery. Also, makes no difference if I use a Multibay battery.
Rang HP to ask what 8 flashes meant and they couldn't ( wouldn't) tell me.
Only clue I have is the possibility I used a replacement 4400mAh battery 6 months ago, and it may have confused the power board/charging system which is designed for the Compaq 3200/3600mAh.
On other Compaqs, 8 flashes is a bad BIOS checksum, buit when I was able to start it, I reflashed the BIOS but it made no difference.
Other people say they have changed the power board, which made no difference, although it would seem the most likely cause.
Since it is only worth £100 or so, a repair is uneconomic. In fact, its worth more as a spare screen, keyboard, hard drive, battery and memory. Mad or what?
I've checked the battery, it shows full charge. The laptop was working fine, and was switched off normally the last time. Removing the battery out and re-trying to switch-ON using mains power gives the same result.
hi ..
i have the same problem the laptop restart after a second ,and some times i can get to the starting (splashing win) the it shuts itself up straight away. the laptop is presario c300. i am just wondering is it posible the problem be on the circut (mob) or the battery?is it the battery's fault? i cant even use it with ac adaptor as well...
any help or advice appreciated..
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