Motherboard asrock P4VM800, we have checked and replaced everything with known good Ram, PSU, heatsink. We have confirmed that everything is connected correctly. when you power on the unit the cpu fan works and so does the psu but THERE IS NO VIDEO. there are no beeps, no flashing lights, no anything. Please help,

Hello you can download a manual here:

http://www.asrock.com/mb/VIA/P4VM800/?cat=Manual

You need adobe reader to read the content.

My guess is the power supply is failing try to change
it with one you know works.

Look also for bad capasitors on the mainboard:




They should not look like this.

If this is the problem the mainboard must be replaced.
It will exeed the price for a new mainboard to let them be changed.

Good luck

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO THE HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

Here is a link for your mobo

http://www.asrock.com/MB/overview.asp?Model=P4VM800

looks like you can use any intel processor as long as its a socket478 by intel

Check out nvidia agp cards at www.nvidia.com You can get a 512mb card agp.

The bios is plug and play which should not be a problem.

You may need to upgrade the memory also.

Refer this for processor : http://www.asrock.com/mb/cpu.asp?Model=P4VM800
Graphics : Slot Type: AGP8X/4X slot, Voltage: 1.5V you can find this type of graphics card in the market.. but you need to let the vendors know what type of slot you want. Good luck..

Please go here for the drivers.
http://www.asrock.com/mb/download.asp?Model=P4VM800&o=XP

And please coment.

Thank you

The best place to download drivers is the manufacturer's website. The Asrock drivers are located here:)

http://www.asrock.com/mb/download.asp?Model=P4VM800

If you were looking for the motherboard manual, it is available from the website in PDF format from here:)

http://www.asrock.com/mb/manual.asp?Model=P4VM800&s=478

If the CPU is dead the problems can be

1. no power
2. no fans etc or
3. power, no beeps (errors)

If the Ram is not compatible it would be constant beeping.

With the board in, and power supply 20pin + 4pin Pent 4 power attached,(#2 and #7 of motherboard layout) remove power cord from power supply.
CLRCMOS0 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and system
setup parameters. To clear and reset the system parameters to default setup,
please turn off the computer and unplug the power cord from the power
supply. After waiting for 15 seconds, use a jumper cap to short 2 pins on
CLRCMOS0 for 5 seconds. Remove the jumper. Remove heatsink and fan from CPU. disconnect cpu and reseat it. Re-install heatsink and fan. Plug in the power cord. Try to boot up. If it still does not boot and (no power, no fans etc.) problem would then be cpu is fried.

Look HERE for a list of bios beep codes

here is the manual
http://www.asrock.com/mb/manual.asp?Model=P4VM800
there you will find the diagram you need...

gluck

Found these for you.. and a Manual also. www.asrock.com/support/download.asp?Model=P4VM800 www.judiciary.go.th/techno/Replase-Computer/48-supreme/P4VM800.pdf