Lenovo G50-45 Unresponsive when HDD installed

[Genaugmen]

I have a Lenovo g50-45 that is unresponsive when a internal HDD is connected. It was just horribly slow, but now it hangs the system after the Lenovo splash screen. When I got this machine it had overheated BADLY, the plastic casing over the cpu had warped from heat due to a bad fan. Also, the HDD was failing. Replaced both, but hard drive performance was dismal as was response in windows. After a bunch of messing around with it, discovered that the laptop operates normally with no HDD attached. Now, unresponsive when hard drive is attached. Stops responding after the splash screen. Anyone have schematics and/or boardview for this motherboard? Any ideas what the issue might be?

[piernov]

Re: Lenovo G50-45 Unresponsive when HDD installed

https://www.badcaps.net/forum/showpo...6&postcount=20

Sounds like a CPU issue to me. This one has the FCH integrated in it, with the SATA controller inside the FCH.

Make sure you try with another hard drive (you could have put a "new" part which is defective). Also make sure the HDD is blank.

Compare the 3.3V/5V voltages on the HDD connector with and without the HDD connected. Also, does the optical disk drive work? If it does, compare diode mode measurement (red probe on ground, black probe on the connector) of the 4 data lines (+/- RX/TX) on the ODD and the HDD connector. They should be more or less the same.