Pc won't boot after cpu change

Cenx

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Apr 15, 2014
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Ive got an Dell Optiplex 620 and I changed my Intel Pentium D HT with an Intel Core 2 Duo, and my Pc won't boot, no BIOS would show just a black screen as well the power button stays orange and doesn't change after 5 minutes but when I change the processors back it works again and boots up normally. Please help.
I know that it is the correct size socket and the motherboard is the Dell 0F8098, if that helps.
The PSU Is 350 watt. I also have an ATI Radeon HD 4850 Graphics card and 4GB of Ram installed.
 
pentium d and core2's do use the same physical socket, but that doesn't mean your bios has any idea what the chip is.

at the very least, you'll need a bios update, if there's one available. (assuming your chipset is compatible with a core2)
 

Kisianik

Dignified


Your PC full model name is Optiplex GX620. This is the list of compatible processors:

Intel® Pentium® D Processor 960
(4M Cache, 3.60 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 950
(4M Cache, 3.40 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 945
(4M Cache, 3.40 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 940
(4M Cache, 3.20 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 935
(4M Cache, 3.20 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 930
(4M Cache, 3.00 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 925
(4M Cache, 3.00 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 920
(4M Cache, 2.80 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 915
(4M Cache, 2.80 GHz, 800 MHz FSB) 095 W

Select Intel® Pentium® D Processor 840
(2M Cache, 3.20 GHz, 800 MHz FSB) 130 W
Select Intel® Pentium® D Processor 830
(2M Cache, 3.00 GHz, 800 MHz FSB) 130 W
Select Intel® Pentium® D Processor 820
(2M Cache, 2.80 GHz, 800 MHz FSB) 095 W
Select Intel® Pentium® D Processor 805
(2M Cache, 2.66 GHz, 533 MHz FSB) 095 W

Core 2 Duo is not on the list - it is not compatible. Generic Intel rules do not apply to Dell - Dell modifies BIOS to limit endless CPU upgrades, so people would buy more PCs from Dell.

More on upgrading GX620 read here http://www.tomshardware.com/answers/id-1679484/upgrading-cpu.html#10827412 there is a link to Dell Community Forum GX620 Guide in the Best Answer post, read it as well.

If you have questions about newer video card for GX620, ask.

Anything else I can help you with?
 

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