You said that you changed the PSU, just verifying that you connected a +12V 4 wire cable from the PSU to the socket next to the CPU? - ''see 3) ATX_12V ( +12V Power Connector)'' on p.17 of the [https://download1.gigabyte.com/Files/Manual/motherboard_manual_ga-8ie800_e.pdf?v=40c6f6c7d0f1165cdede3a434ea54f5b|user manual]. This needs to be connected so the PC can boot
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You said that you changed the PSU, just verifying that you connected a +12V 4 wire cable from the PSU to the socket next to the CPU? - ''see 3) ATX_12V ( +12V Power Connector)'' on p.17 of the [link|https://download1.gigabyte.com/Files/Manual/motherboard_manual_ga-8ie800_e.pdf?v=40c6f6c7d0f1165cdede3a434ea54f5b|user manual]. This needs to be connected so the PC can boot
Try a power refresh and check if that works - see 18) BATTERY (Battery) on p.24 of the manual.
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Perform a [https://help.corsair.com/hc/en-us/articles/360025085372-How-to-Test-a-PSU-Power-Supply-Unit-|paperclip test] on the new PSU just to make sure that it is alright.
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Perform a [link|https://help.corsair.com/hc/en-us/articles/360025085372-How-to-Test-a-PSU-Power-Supply-Unit-|paperclip test] on the new PSU just to make sure that it is alright.
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Try disconnecting the HDD and check if you can start the PC and get into BIOS with a display.
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Try disconnecting the HDD and check if you can start the PC and get into BIOS with a display. If you can, what OS is installed on the HDD, WinXP, Vista, 7, 8.1, 10?
Hi @vagelis48076
Some things to try and to check:
You said that you changed the PSU, just verifying that you connected a +12V 4 wire cable from the PSU to the socket next to the CPU? - ''see 3) ATX_12V ( +12V Power Connector)'' on p.17 of the [https://download1.gigabyte.com/Files/Manual/motherboard_manual_ga-8ie800_e.pdf?v=40c6f6c7d0f1165cdede3a434ea54f5b|user manual]. This needs to be connected so the PC can boot
Try a power refresh and check if that works - see 18) BATTERY (Battery) on p.24 of the manual.
Perform a [https://help.corsair.com/hc/en-us/articles/360025085372-How-to-Test-a-PSU-Power-Supply-Unit-|paperclip test] on the new PSU just to make sure that it is alright.
Try disconnecting the HDD and check if you can start the PC and get into BIOS with a display.