Dimension 3000 won't fully boot with yellow light

You may have to reboot a few times to update the bios with the new card. But there is probably an IRQ problem between the 2 cards. To fix this move the sata card over one slot and try booting again maybe 2 or three times.

See if this solution works:
http://www.fixya.com/support/r4501608-when_windows_xp_start_primary_fix

Vaughn it sounds like the power supply is going bad, try another known good working power supply. If that doesn't work then the motherboard would need to be replaced. If the power supply isn't giving the correct voltages that could cause the computer not to turn on. If the motheboard isn't able to convert the voltages properly then the motherboard could be faulty.

Replace the power supply with a known working one. If it goes away then you know that the original power supply is bad.

If it doesn't go away with the new power supply then you know the motherboard is bad and would need to be replaced.

I believe resetting the CMOS would fix this problem. To reset the CMOS, open up the computer and locate a battery similar to this one (it's on the motherboard):

Picture

Once you find it, pull it out. Leave it out for about 24 hours (one day) afterward placing the battery back into its slot on the motherboard. Now try booting up.

It should now successfully start up requesting that you make changes to the BIOS since the CMOS was just reset. Afterward you should be able to use the computer normally.

NOTE: Try resetting the CMOS with the original RAM inside the computer. The new RAM might be forcing the motherboard to send too much voltage or use an incompatible Mhz setting to support the new stick of RAM.

Let me know how it turns out and if I can do anything else to assist you.

Okay, That helps,
What did you do to the computer *prior* to this issue?
You need to look at a few things. Remove all memory sticks except one.
Try to boot. If it does work, then you have a bad memory stick.
Add another stick and so on.
if you have a Video card in a slot, remove card and relocate to another slot (IF RAM does not fix).
Make sure CPU is fully seated as well.
Can you boot to safe mode using F8 ?
lets get the first 2 things done first tho.
Thanks for the fast reply!!!

Hi try taking the front face panel off first and see what is obstructing the button and put the panel back on again.If you dont know what to look for behind the panel then its better to take it to a repair shop.

i get beeps, but no screen display.

please re partition the hard disk and install the operating system. if the same error continues then change the ram and try

This sounds like the backlighting has faulted, as around the screen there are tubes lighting the screen up, if these are gone they are replaceble but i would suggest taking to a qualified repairer as it is quite a complicated proceedure and get a price first as it may be cheaper replacing the notebook.