Power Supply.
Weak voltage power rail, or more than one.
(There are three power rails for the Power Supply used in your computer;
1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail.
Wires with Orange insulation carry 3.3 Volts
With Red insulation carry 5 Volts
With Yellow insulation carry 12 Volts.
Each wire is connected to one power rail in the Power Supply.
{All Black wires are Ground wires}
The Power Supply in your computer is an SMPS. Switched-Mode Power Supply,
http://en.wikipedia.org/wiki/Switched-mode_power_supply )
I don't know what form factor your Power Supply is because you didn't state which model it is.
Small Form Factor (SFF)
or
Convertible Mini-Tower
or
Ultra Slim Desktop
Post additional questions in a Comment. Also state what model your Compaq Evo D510 is.
Regards,
joecoolvette
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