Having problems with your Dell Dimension 4700 PC Desktop ?

Dell Dimension 4700 won't boot properly.

\015 Original factory memory, original processor, new system board.\015\012The power supply is working and I get green lights on the front and the 4 diagnostic lights on the back: A&B are green, C&D are amber indicating "A possible expansion card failure has occurred."\015\012Problem is, there are no add-in cards installed yet! Even more unusual is I've tried to clear the CMOS by removing the battery, switching the jumper to pins 2&3, then after a few minutes back to pins 1&2 then replacing the battery. Here's the goofy part. The first time it boots up, it goes all the way thru the POST screen (Dell logo and the "progression bar" at the bottom) and moves to the black screen with white text. The messages state it's found hard drive 0, no hard drive 1, date is wrong, etc. Then it hangs.\015\012I power it off and wait a few seconds and repeat the power on sequence. This time it gets about 2/3rds of the way thru the POST screen before it freezes. Power off and repeat. The third time there is no display at all and amber light on front panel instead of green like first 2 attempts.\015\012Allow to sit overnight and it behaves the exactly same; one partial boot and a hang, second time it freezes during POST and third boot attempt no video and amber light on front.\015\012Like I stated at the top, I've replaced the system board and have also swapped out the power supply. Can't decide if I want to replace the CPU next or the memory.\015\012Anyone have any thoughts?\015\012Thanks in advance!\015

Answers :

Disconnect the hard drive and the floppy drive cable at the mother board. The retry POST and try to clear up any problems in POST. If this works fine then the floppy drive cable is either reversed at the unit or the hard drive is jumpered wrong.
If you have more than one memory module in the board, remove them both then re install only one and try again. then try the same thing with the other module to eliminate them as a problem. also try them in all the slots on the board one at a time to see if it's still a motherboard problem.
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