Wont go past Dell Splash screen

Hi Experts!
I have a Dell Optiplex GX520. Upon startup- the Dell Splash Screen appears and the progress bar starts and gets ABOUT 1/2 way...just quite 1/2 way and just stops... and thats it.  I can't get into safe mode or anything.
I have tried Reseating the memory and nothing happened.
Any ideas of what I can try next?
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jaw1971Asked:
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h11Connect With a Mentor Commented:
Check all the caps on  the resistors see if any of them look swelled if so it is probably the mother board.
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Jeff BrownGlobal Helpdesk SupervisorCommented:
as a test  
disconnect the hard drive from the motherboard and power.
and then restart the computer
if the bios will now progress past that point and give you an operating system not found or no boot device  then the problem is likely the hard drive  or the hd controller. (i would bet on the hard drive itself)

and then we can go from there  after you get results of test.

--Wild
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cforantCommented:
Hard drive test is a good one.  You should be able to access that easily.  It may be under the keyboard.

Can you get into the BIOS?  F2 on all Dell's, I believe.  If so, that may give you a clue.  
Are there any beeps?
If more than one Memory SIMM take out one at a time.
Take out and leave out the memory, any beeps then?  (Should get 8 long beeps)
How long did you wait it out?  Maybe it will time out after 5-10 minutes.  I have seen this with Network Card issues.
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willcompCommented:
Press F12 during bootup to enter Dell Diagnostics and run an Extended Test. I'd suspect a bad sector on hard disk.
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jaw1971Author Commented:
Hi
Can not press f2 or F12-- cant get into Bios

Removed Harddrive... still progress bar wont move little under 1/2 way....
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cforantCommented:
how bout when memory is removed.  any beeping???
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jaw1971Author Commented:
Also- Took out BOTH memory sticks. only got 6 long beeps.. how long should i have waited to hear the 8?
I counted 6-- waited about 2 minutes and heard no more beeps.
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cforantCommented:
(btw...for some reason i was thinking this was a laptop...anyway, now i am straight.)
http://support.dell.com/support/edocs/systems/opgx520/en/ug/mtabout0.htm

6 beeps is probably right.  i wasn't totally sure if it was 8.  i knew it was a lot of long beeps.

What do the diag lights indicate on the back of the pc.
http://premiersupport.dell.com/support/edocs/systems/opgx520/en/ug/tools00.htm#wp1114558

BTW...
The F12 is a diag that runs from the hard drive.  Since you are not getting to the hard drive at all, you will not be able to run that diag.  

-Craig
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jaw1971Author Commented:
Well the light code does not make sense..
its 3  numbers 2/3/4 are green
By the way its a formfactor- a small one...GX520.
Anyway-- the USB are part of the motherboard.
 
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Jeff BrownGlobal Helpdesk SupervisorCommented:
light codes indicate a usb failure.   try removing   all usb devices  and try booting up
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jaw1971Author Commented:
no USB devices attached-- still  3 lights- #2, 3, 4
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jaw1971Author Commented:
replaced motherboard all is fine
thank you
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