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Trouble after installing new mobo

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I had a problem with my Dell Inspiron B120 and I was told I needed to replace the mobo. Instead of paying Dell several times what a new laptop would cost to fix the old one. I found a new motherboard and installed it. The laptop power and hard drive led lights come on for about 5 seconds and then they shut off. Any ideas?
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Welcome to G2G

First eliminate the really obvious - do you have AC power connected or battery only? Make sure you are trying it with AC power in case battery is flat!

After that, I would check all the connections - especially the wireless (mini pci) card & the memory. Ensure they are fully inserted in the slots - in the case of the wireless card, try removing it completely if in any doubt. Also try removing the drives.

If that makes no difference, then you may have to strip it down further - check that the cpu fan is connected correctly. You may also need to check the cpu itself for bent pins etc.

I assume the new motherboard is exactly the same as the old one, right? Tell me if it is different. Also, what symptoms were you getting with the original motherboard? If they were the same as the one you're getting now (i.e shutting off after a few seconds), it's possible that another component, instead of or as well as, the motherboard is faulty.
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