Computer problems 1 core 100cent with no reason shown in task manager Tags: New Build Core Computer Intel i5 Task Manager Systems Last response: March 11, 2012 10:44 PM in Systems Share alohascott March 1, 2012 7:17:30 PM Aloha i just recently put together a gigabyte z68ma d2 b3 motherboard with and i5-2400 cpu earlier today i replaced the cpu with a i5-2390t and it was running fine. but now i have one core running at 100 percent and i have no idea what is causing it. the total cpu usage is 32 percent the computer is behaving badly and its very sluggish. It runs much smoother when running prime 95 on all cores then it is now. any ideas? More about : computer problems core 100cent reason shown task manager alohascott March 1, 2012 7:22:24 PM system idle is at 98 percent in task manager, with one core still at 100 percent. i am shutting down and doing an antivirus boot with kasperky (SP) m 0 l alohascott March 11, 2012 10:44:01 PM It was a bad hard drive. please close this thread m 0 l Can't find your answer ? Ask ! Publish Related resources computer slowdown 1 cpu shown in task manager Forum SolvedJava takes up to 1 million memory on task manager. Cpu always above 50%. Computer problem? Forum SolvedTask manager , Cpu z , prime 95 showing that my fx6100 is working on only 1 thread 1 core. Forum SolvedIm facing same problem, my computer is not detecting any flash drives on any ports, but they are shown in Device manager but n Forum More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !