Question My GPU doesn't display on monitor

Apr 28, 2019
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So after I bought a used gpu
it worked fine at first
but then after about three days of using
I turned on my PC but there was no display on monitor
I doubted it might from the Ram or the CPU or something
but everything is working fine
even the dvi cable is okay
I tried another gpu (that doesn't need a 6pin connector)
and the PC worked
I also checked my 6 pin connector and it turned to be okay
so it's from the GPU itself
I searched the problem in many communities and forums and I gathered some solutions
none of them worked
and then I tried updating my BIOS
finally the GPU worked again
but only for once .. it worked once then it went black again
although everything works just fine "no beeb"
fans working .. no strange voices
Please guys if anyone has anything could help
share it with me
I don't want to buy another GPU

my specs :
Core i3-3220 3.3ghz
Ram 8 (4×2) ddr3 1333mhz
GTX 650ti boost 2gb
PSU : Alienware 450w