As i have explained, I am able to get into priiloader, but not into system menu or homebrew channel
So why he can't even get into the HBC also?
the only thing that explains the OP description will be a failed hardware (BT module) to be exact.
launching the HBC from older versions of priiloader may not work due to the title ID change of the latest HBC, but bootmii is usually updated along with the HBC so it should be able to launch whatever version of the HBC is currently installed, assuming it is in fact installed
It's possible that the HBC does not exist on this Wii (ie. older version removed due to system menu update, manual deletion, wii memory format, etc.). If this is the case then the HBC would obviously need to be reinstalled before being able to be accessed.
Also, if the OP has priiloader v0.4 installed, it will not natively be able to launch HBC v1.0.7 or higher if installed (i.e. it can only load HBC's with title ID of "HAXX" or "JODI"). However, the HBC should appear on the title launcher menu, and can be booted from there. But if the OP has an older version of priiloader installed that does not have the title launcher, a HBC v1.0.7+ forwarder dol can be installed as priiloader's file and can be launched that way. However, all versions of priiloader can launch bootmii as IOS, since it's always been installed to slot 254 and nothing has changed in that regard. And once bootmii is loaded, it should be able to launch the HBC if it's installed or the hackmii installer (bootmini.elf) if it's not. And if neither bootmii or the HBC is installed, then priiloader can be used to load the hackmii installer's boot.elf (either by installing it or a forwarder as priiloader's file).
Until we hear more from the OP, we cannot diagnose this problem further... but one this is for certain, hardware failure is NOT the only explanation
Check your priiloader system menu hacks and report what you have enabled. Also tell us what version of priiloader you have installed.
Also, download the bootmii sd files from here:
extract the bootmii folder to your new sd card (i.e. SD:\bootmii\) and try loading bootmii via priiloader again. Then let us know whether this loads the bootmii menu or not.