Since you say that the desktop is “….totally dead”. here’s a [https://www.dell.com/support/kbdoc/en-au/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|link] that hopefully ''may'' help to test the PSU to make sure that it is OK
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Since you say that the desktop is “….totally dead”. here’s a [link|https://www.dell.com/support/kbdoc/en-au/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|link] that hopefully ''may'' help to test the PSU to make sure that it is OK
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If the PSU seems OK get back to having a barebones PC i.e. PSU, motherboard+ram, keyboard and monitor (connect monitor to motherboard's video port) only - disconnect or remove major hardware components e.g. GPU card, HDD, ODD etc and check if it turns on. You can leave any cables connected from the motherboard to the Power button module or front I/O ports etc. Basically you are disconnecting the hardware that draws the most power from the PSU as soon as the system is started
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If the PSU seems OK get back to having a barebones PC i.e. PSU, motherboard+ram, keyboard and monitor (connect monitor to motherboard's video port) - disconnect or remove major hardware components e.g. GPU card, HDD, ODD etc and check if it turns on. You can leave any cables connected from the motherboard to the Power button module or front I/O ports etc. Basically you are disconnecting the hardware that draws the most power from the PSU as soon as the system is started.
If it turns on check if you can get in BIOS with a display (press F2 very soon after it powers up).
If still no good then try resetting the BIOS in case it is corrupted somehow.
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Disconnect the power from the desktop and then remove the coin cell battery from the motherboard (remember the orientation of the battery - usually it is +ve on top as marked on the battery). See p.107 of the [https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_xps_desktop/xps-8500_owner%27s%20manual_en-us.pdf|owner manual]
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Disconnect the power from the desktop and then remove the coin cell battery from the motherboard (remember the orientation of the battery - usually it is +ve on top as marked on the battery). See p.107 of the [link|https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_xps_desktop/xps-8500_owner%27s%20manual_en-us.pdf|owner manual]
''Press and hold'' the desktop’s Power on button for a ''full 30 seconds'' and then release it. This will reset the BIOS back to its factory default setting.
Reinsert the coin cell battery - remember the orientation.
Reconnect the power to the PSU and try turning it on.
Hi @michael500 ,
Since you say that the desktop is “….totally dead”. here’s a [https://www.dell.com/support/kbdoc/en-au/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|link] that hopefully ''may'' help to test the PSU to make sure that it is OK
If the PSU seems OK get back to having a barebones PC i.e. PSU, motherboard+ram, keyboard and monitor (connect monitor to motherboard's video port) only - disconnect or remove major hardware components e.g. GPU card, HDD, ODD etc and check if it turns on. You can leave any cables connected from the motherboard to the Power button module or front I/O ports etc. Basically you are disconnecting the hardware that draws the most power from the PSU as soon as the system is started
If it turns on check if you can get in BIOS with a display (press F2 very soon after it powers up).
If still no good then try resetting the BIOS in case it is corrupted somehow.
Disconnect the power from the desktop and then remove the coin cell battery from the motherboard (remember the orientation of the battery - usually it is +ve on top as marked on the battery). See p.107 of the [https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_xps_desktop/xps-8500_owner%27s%20manual_en-us.pdf|owner manual]
''Press and hold'' the desktop’s Power on button for a ''full 30 seconds'' and then release it. This will reset the BIOS back to its factory default setting.
Reinsert the coin cell battery - remember the orientation.
Reconnect the power to the PSU and try turning it on.