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No error codes on 486

skylab060398
skylab060398 asked
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Last Modified: 2010-04-27
I am working on an AMD 486 DX4-100. When I first saw the computer, I turned it on and I got the 1 beep but nothing on the screen. The floppy and hard drive did not even try to activate.
No problemo, I took the entire computer apart, cleaned up an inch of dust so I could see the motherboard and proceeded to hook everything back up properly.
I booted the old gal up and . . . same thing as the first time. Not beat yet, I pulled out my trusty "Post Card", inserted it it and . . . no error code. I checked the voltages and all was OK.
It appears I am not even getting to the "POST".
Where should I go to next? BIOS Chip? Battery?, or Motherboard?
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Commented:
Just wanted to concur with jhance.


John C. Cook

Author

Commented:
Well I have tried all the above except the CPU. I will give it a shot. If a known working CPU does not work I guess I have to assume the Motherboard is shot.
I put in a new (exactly same) BIOS chip, New good RAM and tested power supply.
Thanks for the answers so far, I'll award the points once I successfuly boot up (after new CPU).

Author

Commented:
Well I have tried all the above except the CPU. I will give it a shot. If a known working CPU does not work I guess I have to assume the Motherboard is shot.
I put in a new (exactly same) BIOS chip, New good RAM and tested power supply.
Thanks for the answers so far, I'll award the points once I successfuly boot up (after new CPU).

Author

Commented:
Well I have tried all the above except the CPU. I will give it a shot. If a known working CPU does not work I guess I have to assume the Motherboard is shot.
I put in a new (exactly same) BIOS chip, New good RAM and tested power supply.
Thanks for the answers so far, I'll award the points once I successfuly boot up (after new CPU).

Author

Commented:
Ooops! I forgot about this one. Sorry about that folks.
I will give the 75 points to Jhance not because he was right but because I left it so long.
It turned out to be the motherboard itself, the person who dropped it off to me neglected to tell me that his Motherboard suffered a "crack" a year or so back but worked OK . . till now!
I must also appologize for the repeated entries (comments) I guess I screwed up somehow.

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