The drive in my pc does not see any thing . i tried downloading drivers from hp and nothing it is an hp pavillion a520n

try a driver upgrading/downloading software

On motherboard. Please, make sure all fans are connected into motherboard.
Some fans can't plug in into the board at all. So, you can ignore those fans.
When you go to Bios to check thermal condition, if a fan is not plug in, you can see 0 degree. 0 degree dosen't cause the shutdown problem. (That's why you can ignore)
Then check which fans are causing problem, first. (If you did and found the problem, go next.)
Replace fans AND clean those dust!
If the problem remains, then replace its case to steel one.

Well, usually a lifetime of CPU fan is pretty longer than others.

Just in case, one more thing, if the thermal condition is OK, then the shutdown problem is caused by something ales!

Well I have found all the drivers, here for you.
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=228&lc=en&dlc=en&cc=us&lang=en&product=404643

Here are some great source where will will get any kinds of HP,ACER,DELL and COMPAQ laptop Solution and any kinds of Driver download.

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abarasa79

Which light?? the network light?? Do you get anything when you press the power button if not it is most likely the power supply since the motherborad is still showing power also may be cpu!

You can get those drivers from here:
http://baixardrivers.com.br/bios-hp-pavilion-a520n-desktop-pc-bios-hp-pavilion-a525cn-desktop-pc-ap-bios-hp-pavilion-a530e/download-13266.htm

Remove the power first then:

Take the side panel off and make sure that all of the connectors are secure in their sockets

It is possible that the machine was bounced and the power connector from the PSU has come adrift .

Check the wiring from the front panel power on/off switch to the push on connectors on the Motherboard

Go onto www.hp.com and download an installation manual for the machine or look at the Motherboard when you have the cover off and go to their website and do the same thing

you have to send it back to hp to get it fixed, this is the second time mine had the same problem

sure..go to control panel, sound settings, and you should be able to check if the slider is in middle or left or right..same thing with generic sound in tray at bottom.

check your warranty here for FREE

http://drivers.softpedia.com/get/FIRMWARE/Others/HP-Pavilion-471uk-Philips-DROM6016-16X-DVD-ROM-Firmware-HD14.shtml
try this link. and download the firmware. your cd drive should work after it is installed.