ERROR:394 MY DEVICE CAN'T BOOT,WHEN I SWITCH IT ON IT DISPLAY DEVICE ERROR:394

This means that the door is not being closed. It might be a bad door switch.

Sounds like a disk issue. It kind find the OS so it's then trying to PXE boot (boot from the network). Have you changed the boot order recently? or do you have a USB key connected to your server? are you able to connect to the management interface (hp ilo, dell drac) to see if you had any raid or other hardware issues?

Your operating system is probably outdated for the firmware of the device you are trying to connect. Upgrade.

A) Installing same version of Windows, or a lesser version;

Enter BIOS Setup, and in Boot Options, set the first boot device to CDROM.

{Windows doesn't like being copied over by the same version, or a lesser version.
The above will make the computer boot up from the Windows XP sp3 disk you have}

B) If your computer came with a version of Win Vista, and you are trying to install WinXP over it, reply in a Comment.

For additional questions please post in a Comment

Regards,
joecoolvette

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.

That error shows up when Windows find an irreversible error on the Hard Disk Drive. I'm sorry to say that the only solution is to change the Hard Disk Drive.

Here is the instructions to reset the fuser maintenance count:

HP Color LaserJet 5500/5550 Maintenance Code Reset Instructions

1. Press the ? button until the display reads "CONFIGURE DEVICE" and press ?.
2. Press the ? button until the display reads "RESETS" and press ?.
3. Press the ? button until the display reads "RESET SUPPLIES" and press ?.
4. Press the ? button until the display reads "FUSER" and press ?

This should reset your printer and clear the error message.

I hope this helps, if so please rate my solution,

BuddyMc

Clear NVRAM with the help of Maintainance switch

I did try all that, and it didnt work, on a 5050 acer built on a 3100 gabinet.

I think that the problem is that the cardreader chip is not well glued to the motherboard, that's why it gives you that error. If you try pressing certain points of the computer while booting, it miraculously stops giving that conflict error.

We should be payed back by Acer, as this is an project issue =P