hi sorry for delay. i did run memtest several times, everything was okay. i did a memory test using ubuntu system tool and got the following result: memory/info PASSED
below's the output you asked for: antoni@xxu:~$ sudo lshw -c cpu [sudo] password for antoni: *-cpu description: CPU product: Intel(R) Pentium(R) 4 CPU 2.40GHz vendor: Intel Corp. physical id: 4 bus info: cpu@0 version: 15.3.3 serial: 0000-0F33-0000-0000-0000-0000 slot: CPU size: 2400MHz capacity: 2400MHz width: 32 bits clock: 533MHz capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc up pebs bts pni dtes64 monitor ds_cpl cid configuration: id=0 thanks for help -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/889815 Title: hidden 100% cpu usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/889815/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs