[SOLVED] Monitor goes to "no signal" after switching graphics card

Aug 7, 2019
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I have gtx 1070 & 1050. lately I use gtx 1070, then I'm curious to try again using my gtx 1050. after i installed gtx 1050, my pc didn't enter bios and it displays "no signal". then I tried to replace it again with 1070, after 1070 installed the monitor did not enter the bios and the monitor still displays "no signal". I don't use onboard GPU because I use i5 9400f.

Edit:
For info: i have the latest driver for gtx 1070 installed already.

Please help me fix it. Thank you