BM Thinkcenter E50 8291, stuck in boot loop

[srispiky]

I have IBM think center pc went into boot loop.. As soon as system try to load OS system.. System goes into restart loop..
https://www.cnet.com/products/lenovo-thinkcentre-e50-8291-p4-640-3-2-ghz-1-gb-160-gb/specs

I use the above mentioned pc.. I have replaced the 160gb HDD with 80GB Hitachi HDD..

 

[hang-the-9]

Need more details here, you replaced the drive, did you make sure that replacement had no errors? Did you install a clean setup of Windows on it? Did you try different RAM or running one RAM stick at a time?