[SOLVED] fan splitter prevents windows from booting

[gamified]

so i bought this fan splitter for my pc for my two case fans and when i try booting up, windows goes into automatic repair mode and fails to find any problem. also when i try to boot up my pc without the fan splitter the same issue happens. what went wrong? all i wanted to do was add a fan splitter and now my entire pc wont boot. ive tried window's cmd console repair process. im genuinely pissed because i have no idea how this happened and what is wrong
additional info: this fan splitter is/was an addition to my build i have been using since feb. , my mobo is an asrock z390 pro4
i have no idea what happened and thanks in advance to those who help me

 

[mdd1963]

despite the timing, the use of (or lack thereof) the fan splitter might be unrelated to your seemingly corrupt OS installation/boot-up issue(s)...

You might need to make a Win10 USB installation media, and attempt a repair install from there, or essentially, a 'reinstall/keep data and programs'...

 

[--SID--]

Why do you need a fansplitter for two fans when the motherboard has 3 fanheaders?

 

[gamified]

Why do you need a fansplitter for two fans when the motherboard has 3 fanheaders?

for some odd reason only two fan headers work, two 3-pin for the case and cpu