Constant rebooting on\off every 2 seconds

More then likely running System Tuneup replaced critical files that Comcast Constant Guard and Quattro Pro uses... I recommend doing the following three steps but only if you have the Original or backup copies of the installation disc/media for both applications: 1) uninstalling the Comcast Constant Guard application 2) then do a normal shutdown and reboot once it has rebooted 3) install the Comcast Constant Guard once that's done and successfully do the same three steps but for the Quattro Pro application

Access the manufacturer's web-site: http://support.hp.com
and enter the model-number of your HP system, and do the search.
Select the downloadable documentation, namely the "Service Manual",
which tells a qualified technician how to disassemble that particular model.
Follow the instructions.

You can find them at Best Buy.

WHY NOT GET IT FIXED.?
NOT ONCE RUN IT WITH NO BATTERY AT ALL.!!!
FAIL NOW?, BAD POWER PACK IF BIOS IS DEAD
WORKS NOT, BATTERY IS DEAD SHORTED , BAD.
EASY NO?

ALSO KNOW SLEEP MODE! facts of life.
Only works if all driver on laptop are correct at hp.com
or it will fail for sleep.
or virus infected.
turn off sleep mode (ac/ and batter) under powers settings CP
work now>? i bet does, (battery out)

new power pack but why do that, take out the battery first
laptops need no battery and with no battery it can run perfect
does it.?????????????????? (ac wall power good sure)

The DVD drive is usually held in place with two screws some-times one. These screws can be found on the underside of your laptop, the screw will be marked with a picture of a DVD/CD. Once these screws are removed the DVD can simply be pulled out and the exact replacement drive can be installed. Now reinstall the screws and bam, you're all done!

All the best!
damnor01

Laptops getting hot when use is common,it is just some models are too hot,you can buy a Netbook Cooler Pad to prolong the life and use of your DV9910US 17-Inch HP Laptop PC Notebook

Hello,

try this: Fn + F12 to increase speaker volume.

If it doesn't work, then you will have to reinstall your audio drivers to rectify the problem.

Take care.

Below is a link to download the sound drivers for your laptop. Download, install and reboot and everything shoud be fine.

ftp://ftp.hp.com/pub/softpaq/sp28001-28500/sp28481.exe

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alkllklju20

Well its vista, second have 512mb of memory and the video is it a dvd. upgrading the memory might help