Dell Optiplex GX150 will not boot - no beeps but has error lights

Sounds like the boot sec is missing run restore disks

download and install the xp soundcard drivers for the gx150 here-
http://support.euro.dell.com/support/downloads/devices.aspx?c=uk&cs=ukdhs1&l=en&s=dhs&SystemID=PLX_PNT_P3C_GX150&os=WW1&osl=EN

go to the bios by hitting f2 then find boot order find disk drive a and disable it.hit exit save and restart if this does not solve the issue then you need a tech to install a cmos battery on this system and flash the cmos .

RAM is corrupt...long beep denotes no RAMs or RAM is not working properly....

This normally means there is a memory error. Have you recently added memory to the sytem? You can try to remove and reseat all memory modules in the system to see if that clears the problem.

Here'w what I would do: Unplug everything (hard drive, CD, DVD), and even consider taking out the modem if you have one. Now try to start it. If it starts (but, of course gives you a "missing boot device" error, start it up with only the hard drive. If there is a speaker in the system, you might consider removing the memory to see if it gives you an error beep code. If these things don't work, then you're looking at a new motherboard.

Hmmm--when you went into the BIOS setup, your first boot device should be CD. The next your hard drive. The other boot devices should be set to disabled. Now if you have a third boot device as a network device, then your computer is not seeing the CD or the Hard drive--you have a problem. If all the drives are hooked up properly (sounds like you have that covered) then your motherboard is probably the problem.
I would try to disconnect all your stuff except the CD. Try it on the first IDE channel (set it either as cable select or master). If that fails, try it on the other channel. Do you have a second CD to swap out?
Still no boot? Bad motherboard.

Try to boot the PC without the XP Home CD in the CD drive, and keep pressing the F8 key until it comes up with a boot menu that includes a Safe Mode option.

If you had the XP Pro CD I'd suggest doing a recovery, but XP Home doesn't have that option I don't think.

You may have to try a few times until the boot menu appears. Don't hold the F8 key down - keep pressing it!

When you get into Safe Mode, right click on My Computer and choose Properties. Then go to Hardware tab (i think - not in winXP right now) and choose device manager. Just remove the Video Card from the list altogether, and then restart. Should force it to use generic video card drivers.

then check your video card model and look for the updated driver

I have experienced this problem as well, it is either the CD is scratch or the CD-rom lens needs cleaning, however it can read the content of the CD, I would susgest you try a another CD-rom , borrow it from a friend. It works for me.

try going to the bios by pressing f2 or delete key on the keyboard at the dell logo.
if you are able to enter the system setup screen, reset the bios.
to reset the bios, press num lock, caps lock and scroll lock so that all 3 lights on the keyboard are on.
press alt + e and alt + f keys.
press esc twice
then select save changes and exit.

also try booting through the safe mode by hiiting f8 on the dell logo.

you can also try booting through the dell resource cd or win xp cd.