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Sony Vaio won't completely boot

I have a Sony Vaio VGN FS675P/H laptop that just had a new mobo installed. The laptop was running XP Pro. After reassembling the machine, it either freezes at the Vaio splash screen or if I reboot at that point I get a beep code of 1-3-1-3, which for Pheonix BIOS means A20 gate error or keyboard controller/keyboard error. I can't get into the BIOS at all. The hard drive and memory chips were perfectly fine before the "surgery".

While taking the laptop apart, I had some difficulty removing the keyboard connector from the old mobo. There are visible scratches at the end of the keyboard connector. My question is should I bother spending $60 on a compatible keyboard, or is there something else I should try before?
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8/22/2022 - Mon

1) Can you try an external keyboard ?

2) It soumds like there might be damage to the motherboard/ or connectors.

Are you experienced at doing this kind of work, or a first timer ?

I hope this helps !

I am fairly experienced with this type of thing, although my hands really are too big to be messing around with laptops! The reason I posted this question is that if it is a problem with the motherboard, I need to return it where I purchased it within 30 days. I tried the external keyboard, but the laptop hangs after the music and animated vaio splash screen. I wouldn't think the computer would be capable of the splash screen if the motherboard was not functioning, but if the keyboard controller on the mobo is bad, then I guess it could cause the computer to halt on the keyboard error.

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You were correct about the connections. I took it apart and lo and behold one end of the ribbon connector for the touch pad was loose, which apparently gives a keyboard error. I re-connected it put all back to gether and all is working fine.

I am relieved that I don't have to ship this mobo back to Hong Kong, It took over two weeks to get through customs the first time! Thank you, and you have the points.
Your help has saved me hundreds of hours of internet surfing.