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Here are the following steps you can try to fix this issue, ive experienced it myself using a dell PC and it works on my end.
You have what is called a No Post No Video Situation.
1: The Modem can cause a No Post No Video. Pull it and see what happens. If it still does not boot. Strip the System down with nothing on the Board but Power Supply Processor and Fans. This
Includes All Memory, All Cards, All IDE Cables. Hook just the Power up
and See if you get Memory Error Codes ( Beep Codes ). If you Do ( And
you Should ) then Reseat the Memory ONLY. If you dont more than Likely
it is the Power Supply or Motherboard. If Reseating the Memory
back in Memory Bank 0 causes a No Post. Pull the Memory and put the
Memory in Bank 1. If it Post then Bank 0 is bad on the Motherboard. If
it Dont, You Need Memory. If you have more than 1 stick then try with
one or the other and make sure one of them is not bad. If it is Rambus
Memory you will need to add both sticks, because Rambus is Required for
Pair. If in Bank 0 the System Posts, add the Video Card and
connect the Power and Monitor. You should get Post and Video. If you do
not, Video Card is bad. From there add the Hard Drive IDE and
Boot the System. If it does not boot then try the IDE Cable in the
CDROM Controller and see what happens. If it Boots then the Controller
on the Motherboard is bad. If it Causes a No Post No Video, Hard Drive
is Bad. From there Add One IDE Back at a time and make sure it is
none of those drives or Controllers. If you find that one of the Drives
is causing a No Post No Video, Try a Known Good Drive. If it Posts and
Boots. The Drive is Bad. If it Dont, The Controller on the Motherboard
is bad. After that Add one card back at a time. Find out which
one is causing the Issue. Sometimes Reseating everything works fine. If
none of these work then You May have Either a Bad Power Supply or a Bad
Processor. Also dont forget that you may have had a Surge or Storm and
May have Caused a the Motherboard to get damaged. Dell has a Good Artical on Steps to do for this at http://support.dell.com/us/en/kb/document.asp?DN=TI1014149
The beeping is caused by your computers POST( Power On Self Test - learn something new everyday! ;) ) Find your motherboard manual, and have a look in it for beep codes, or error codes. The number of beeps will let you know what kind of problem you're dealing with. If all is well in POST, your computer should only beep once, and continue. Can you get into BIOS at all, or does it just show you your videocard info on bootup, then black screen?
motherboard is doing a check and failing something another component either CPU, Monitor or memory usualy) (google search bios beeps for your make/model) to determine what.
if you cant find it, just ensure the above 3 are correctly seated by taking them out and putting them back in again.
Try starting the PC in safe mode (press F8 as it starts) and then restore your PC to a date before you installed the updates.If that fails you must use your windows 7 disk to repair the system or just install it again.....
your computer is failing its POST (diagnostics). open the case and reseat all the cards and memory. make sure your CPU's cooling fan runs when you power up. recheck the disk drive cables and power connectors. good luck!
Aside from the obvious, to check the power switch on your monitor, check the power connection to the monitor in back of monitor and at power source, check power source is good, and check to see that the video cable from the monitor is firmly connected to the computer.
If this series of checks reveals nothing, you could try: Shut down computer, unplug the video cable from the back of the computer start computer, then shut down and replug it in, then rebooting your system.
If this fails, you need to check the monitor on another working system or check another monitor on your system and determine whether the monitor or your system settings are at fault.
Let us know what you discover.
If this information solves your problem, or answers your question, please take just a moment to rate this post...thanks!!
Have you got your WindowsXP CD?
You could put it in the CD drive and let it boot from CD. Then select "r" (Repair Option).
This will attempt to re-install your xp without losing data. (Not always possible)
If you have no data on the drive that you want to keep then you could ignore the repair install and try the full re-install.
you will need your motherboard drivers etc for this.
It sounds like your Boot records or system files are corrupt.