Changing motherboard on centos 7

[Blisk]

I have changed motherboard, processor and ram and started centos 7, but it won't load, I get some error pinging and nothing happends.
I tried also rescue mode but also get some errors.
Where to start to solve this problem?

[TrevorH]

Does it boot at all? If not then boot the rescue kernel and recreate your latest kernel's initramfs file using dracut. If it does boot then give exact errors.

[Blisk]

yes it boots and than stuck on some level when booting normally, when in rescue mode than I can access system normally.
You mean this?
https://wiki.centos.org/TipsAndTricks/CreateNewInitrd

[Blisk]

When booting normal I get
rejection I/O to offline device

[pjsr2]

The rescue kernel and initramfs contain a wide range of modules to handle basically all supported hardware.
A normal kernel and initramfs are created in such a way that only the modules needed for your specific hardware are included. That is why you have to re-run dracut after a major change in the hardware.

[TrevorH]

But rejecting I/O to offline device sounds like you have a hardware problem.

[pjsr2]

rejection I/O to offline device

Do you have a device that changed name? Name of disk partition that no longer matches what is in /etc/fstab or network device name that has changed?

[Blisk]

OK I finally figured out what was problem, it was one of disks which was bad, I copied disk and now it is new in and it works.
But have some new problems, apache will not start anymore. this is error I get
-- Unit httpd.service has begun starting up.
Jul 15 13:18:23 povej.net httpd[13585]: [Sat Jul 15 13:18:23.980544 2017] [so:warn] [pid 13585] AH01574: module expires_module is already loaded, skipping
Jul 15 13:18:24 povej.net kernel: /usr/sbin/httpd[13585]: segfault at 7f3f6ced8ca1 ip 00007f3fd831a6f0 sp 00007fff208b6c48 error 4 in libnsl-2.17.so[7f3fd8311000+16000]
Jul 15 13:18:24 povej.net abrt-hook-ccpp[13587]: Process 13585 (httpd) of user 0 killed by SIGSEGV - dumping core
Jul 15 13:18:24 povej.net abrt-hook-ccpp[13587]: Failed to create core_backtrace: dwfl_getthread_frames failed: No DWARF information found
Jul 15 13:18:24 povej.net systemd[1]: httpd.service: main process exited, code=dumped, status=11/SEGV
Jul 15 13:18:24 povej.net kill[13590]: kill: cannot find process ""
Jul 15 13:18:24 povej.net systemd[1]: httpd.service: control process exited, code=exited status=1
Jul 15 13:18:24 povej.net systemd[1]: Failed to start The Apache HTTP Server.
-- Subject: Unit httpd.service has failed

[TrevorH]

Time to run memtest86+ for a day or so and see if it finds anything wrong.

[Blisk]

OK I will change RAM and see if there is some changes.