I have ASROCK P4VM8 mother board nturally it displayed blue screen. I tried to install win XP but I couldn't install, I tried to boot safe mode but it didn't boot, then what can I do?

You are going to need to start your computer in safe mode and find the XP drivers that will work for your motherboard manually from the web (Assuming that there are any created for XP for that board)..

That blue screen you keep getting is because you don't have the correct driver loaded for something on the motherboard that it needs to boot correctly and your XP install couldn't find it on the web to install automatically.

Start your PC and press F8 several times until the boot menu comes up. Then select "Safe Mode with Networking".

Now start looking for your drivers here:
http://www.dell.com/support/drivers/us/en/19/Product/optiplex-780

You are going to need to start your computer in safe mode and find the XP drivers that will work for your motherboard manually from the web (Assuming that there are any created for XP for that board). That blue screen you keep getting is because you don't have the correct driver loaded for something on the motherboard that it needs to boot correctly and your XP install couldn't find it on the web to install automatically.

Start your PC and press F8 several times until the boot menu comes up. Then select "Safe Mode with Networking".

Now start looking for your drivers here:
http://www.dell.com/support/drivers/us/en/19/Product/optiplex-780

You have set the resolution or refresh rate of your display adapter to a value which is too high than what is supported by your monitor.
In order to fix this, you have to do the following:
1. Reboot your computer & press F8 to boot into Safe Mode.
2. Once in Safe Mode, open Device Manager.
3. Remove the display adapter device driver form Device Manager.
4. Reboot your computer again. Windows will boot up normally & will detect the display adapter. It will prompt you for the device driver for the display adapter.
5. Use the CD that came with your display adapter to install the device driver. Once done, your problem is fixed.

Sounds like you need to reinstall xp and start again

http://www.asrock.com/MB/overview.asp?Model=P4VM8
The TWO blue long connectors on the board with clips at either end are the ram slots, this model uses DDR1 ram, make sure you align the ram module correctly in the slot

I think the problem is with your RAM installed, try to swap other memory on your computer or try your RAM to other PC to determine if its working.

If you have a valid Win XP Pro CD and want to install the operating system you'll need to format your hard disk drive. If you have allot of data on you're hard disk drive, (In Win 2000) Suggest you create a second partition within the free space of you're hdd and install windows XP Pro. Boot you're system with the XP CD. Pay close attention to the display screens. Follow the instructions for creating a second partition.
Format the new partition. (Quick). Install windows XP on the new partition. Once completed you can copy your personal data to win XP.
If you choose to keep the win 2000 partition and you do not wish to have a dual boot system than remove/delete the root files from the 2000 partition. These files; Autoexec.bat and Boot.ini. You're new XP Boot.ini should read like this;
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /usepmtimer
Once you're satisfied an no longer need win 2000 use windows diskmgmt.msc from the run command to delete the win 2000 partition.
Win 2000 uses a FAT16 where Win XP uses the FAT NTFS.

Cheers!
Mike

http://www.asrock.com/mb/download.asp?Model=P4VM8 this is where i got my drivers. what happens when you disable the on board modem feature in the bios? does it boot? also if you have an empty pci slot-you can add a new one. and disable the modem in bios(if bad modem)-so disable it,boot normally,then remove the drivers for that device,if any. then reboot enable it,then try drivers again. adding a new one is an option, if all else fails! good luck with that. if you need further help reply.

You might try removing the Hard Drive from the machin and slaving it on your other machine. Then running a chkdsk in the command prompt or norton disk utilities. If either fails, backup your data on other machin and reinstall.

I think you may need to repair your installation of windows XP or if that doesnt work, just reinstall it fresh.