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Okay I originally bought a Lenovo ThinkCentre computer, and now I have upgraded it so much that from the parts I am not currently using any more I could build a new one. I have put together all of the original parts for the lenovo computer but it won't start. What happens it I hit the start button the fans start up the hard drive starts turning, some times you can hear the driver head start moving as well.

Parts in use:
Mother board- Lenovo, no other details
Memory- Samsung 4GBx2
HDD - an acer one (had to buy it, original is in use)
Power Supply - Huntkey 250w
Graphics card - None currently because I am just trying to get into BIOS, still has same problem when I install my AMD r7 250 of which has worked in the past.

I have already tried: Removing the clock battery and CMOS jumper then putting them on, Swapping around RAM including different RAM, tried a different PSU (no change).

Also no beep errors.

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  • does it stay "on" or does it power off?
    – Keltari
    Nov 7, 2015 at 3:55
  • stays on for 3 to 2 seconds then turns off, but if I do not let it stay off with out power plugin for 30 seconds then it won't turn on at all. Also when it dose turn on it dose not beep and does not out-put any display either. Nov 7, 2015 at 4:25

1 Answer 1

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I had a similar issue with my computer previously. The fans would start up, the computer would shut down, and then the fans would stop. I found the issue to be bad thermal grease. Thermal grease is a paste that goes between the CPU and the CPU heatsink. Sometimes, after taking apart the heatsink and CPU and then putting it back on later destroys the bond between the heatsink and the CPU. Newer CPUs heat up so fast that this could overheat the CPU in a matter of seconds. Your best bet would be to buy some new thermal grease and reapply it to the CPU. Thermal grease can be purchased at a local computer hardware store or online. The best quality ones are those that have diamond particles in them. Silicon based pastes (usually gray) also work well. When purchasing the grease, avoid carbon-based thermal grease (usually black).

The old paste can be removed by first using a dry q-tip to pick up all the paste on the heatsink and CPU. Once most of it has been picked up, use another q-tip with isopropyl alcohol to remove the last parts of it. The new paste can be applied by putting a small amount on the CPU and spreading it around with an old credit card or bossiness card. The trick is it have a very fine layer that is equally distributed on the CPU. There is no need to apply it on the heatsink, as the grease on the CPU will be sufficient to create a bond.

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  • Okay will try soon Nov 7, 2015 at 22:54
  • Sorry but didn't work Nov 8, 2015 at 1:04

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