Wont start up!

[Commited]

I was at my grandmothers the other day, and my uncle had given her an old 486/33 for free.
I had a look at it because i have loads of old processors, and i was going to give here a 166. Then, after taking of the heatsink, and removing the processor to have a look at the pin sequence, i put it all back together correctly, or so i hope!!!
Then I flicked the switch and no LED appeared, nothing. Dead.
Check if there was power going through the PSU, there was.
Checked the motherboard power supply lead. Fine.
Tryed it again. Nothing.
Please help me because i feel really bad, as she had just got a modem and she was oing to go n the net.
If i can't fix this i have to give here my PC!
HELP!!!!!!!!!

[Commited]

HELP!!!!!!!!

[marty]

The obvious suggestion here is to undo exactly as you did and reassemble. You have to hope it is a bad connection!

Also check that nothing else was disturbed by accident. You could have easily touched something that was unintended as you checked the CPU.

Always do the simple things first.

[Commited]

I checked the mobo power supply.
Does the pc not post if the CPU is in incorrectly. Its weird because its a socket 3 and has no missing pin like the socket 7 or 5 to show you exactly where to put the chip. It was really weird. I'm least favourite grandson!!!
Oh well. My uncle is havin a look at it today. I cant check it cause she lives about an hour away, and i have no car!!!!!!!1

[Commited]

HELP!!!!!!!!!

[Newbie_Doo]

I hope Grandma's stars are aligned. The best case scenario is that restoring the old CPU to the socket will at least make it functional again. The 486 used a ZIF Socket 5. This socket was compatible up to the P100. For the P133 and up, the Socket designation was Socket7. The difference being mainly voltage pinouts for the 133 and up. They were backwardly compatible, so you could run a 486 on a Socket7 but not the other way around.

Look for a dot or star or arrow on the CPU. If you are looking at the 486 CPU on the die side, Pin A1 is lower right, Pinside view it's lower left. There should be a corresponding dot/arrow/star on the socket too. Line up the dots, insert, pray.

Good luck.

[Commited]

I inserted in the CPU. Does it have a system so that if the chip is in wrong it wont start.

[Newbie_Doo]

I don't believe so.

Are you sure that the socket doesn't have an identifier on pin 1?

[marty]

Hey Commited,

Are you saying that you put a 166 Pentium in a 486 motherboad? Did you put the old chip back to see if that would fix things.

Or did you just look at the 4896/33 and put it back in the board?

I'm lost.

[Commited]

marty (Mar 12, 2001 07:47 p.m.):
Hey Commited,

Are you saying that you put a 166 Pentium in a 486 motherboad? Did you put the old chip back to see if that would fix things.

Or did you just look at the 4896/33 and put it back in the board?

I'm lost.

I put the original chip back on the board, but the only identifier was the base of one of the pins was a square pin.

I guessed where it went!

I know a sh*t load about PCs so i felt kinda stupid!