I have dell dimension 4700c I just get black screen all diagnostic light are green there are on beeps I have try F2,F8,F12,Windows turn it on take power cord out nothing is working pleas ehelp

The most possible cause is that RAM isnt attached properly on motherboard, it might loosen up sometimes. So just try to check your motherboard, pull out the RAM carefully from the RAM SLOT & attach it precisely. Hope it will work....

Yes, this sounds like the traditional black screen issue, but it's different! This machine is a Dell Dimension 3000 with XP. System won't boot. After Blue Dell BIOS splash screen with F2 & F12 options, it just goes black. There will ultimately be a white cursor in the upper left hand corner. I can edit BIOS with F2, I can get in to the boot menu with F12, but I can't do anything after that. I can even get in to the Safe Mode menu (F8), but it never boots.

Fried CPU??? I've had a few Dells where the plastic CPU mounting bracket broke off and the heatsink didn't sit on the CPU properly.

Make sure all the plugs are well seated, especially the power plug for the computer and monitor, and the video cable between the computer and monitor. Also check the power strip the computer is plugged into to see if it's tripped.

Try re-seating the memory modules. If you have 2 or more modules, remove one at a time and power on the unit.

try this:

Power the PC off, open the case cover, remove/reseat the video card in the slot.
* Power the PC off
* Disconnect the PC power cord from the rear of the PC
* Remove the computer cover
* Move the RTCRST (Clear CMOS) jumper from pins 1/2 and place it on pins 2/3
* Press the PC power button
* Move the jumper back to pins 1/2
* Remove/reseat the video card in the slot
* Replace the power cord and cover and then power the PC on

Hope it helps

There may be a problem with your windows installation. Search Google for Hirens boot CD, it is a free download and should contain a live XP installation. When you turn on the computer tap the appropriate button to reach the boot menu, then insert the CD and select your CD drive. Once booted it should display a live XP.
Alternatively you may have your monitor set to an incompatible resolution. If tapping F8 won't display the advanced boot menu then try finding an auto setup on your monitor or change the resolution using the monitors controls. If the advanced boot menu does display then select low resolution mode.
Hope this helps,
www.PuterCare.com

Turn the computer's power on.
Immediately put the original Windows XP CD into the drive.
Tell the computer to boot from the CD (not from the hard-drive).
Does it start to boot from the CD?
Do you get as far as the "repair/install" boot-screen?
If so, your basic hardware is OK, and turn your computer off,
rather than choosing "repair" or "install".
Then, it's probably either the hard-drive that is failing,
or the installed copy of Windows XP is fuddle-duddle-ucked up, so that it cannot finish the "Windows startup" processing.

Remove the cmos battery and unplug comptuer for about 15 to 20 minutes. install battery working battery. make sure you didn't knock any cables loose

Check ram is seated
Check video and audio cards are seated properly

Then try booting pc.

ok
when u power up the paltop press F8 key then go to last known good configuratuion if probelm remains same then chosse safe mode then remove your network driver from it.
also try to rest your defauls sdetting in bios .
when u power yup the laptop press del or F2 or F5 to F12 try this key one by one.
then go to load defauls settitngs then save that settings.
also check in enable vga mode when u press F8 key at power up.go to enable vga mode tthen settings of disaply porperties.800*600 or 1024 *768.