[Paul R.]

Without knowing the brand and model number of the motherboard it is difficult to day. A lot of things can go wrong before the graphics display shows anything (bad PSU, loose connector, bent pin on CPU, etc). A high end gaming mobo will typically include a two digit LED display with POST codes indicating progress. The codes vary depending on the manufacturer.

A lower end mobo might emit coded beeps to a traditional PC speaker connected to a pair of pins on the mobo. Again the beep codes will vary.

No beep, no LED display. Has a button for apparently some sort of memory test - looks like it maybe parallels tiny button labelled for same on MB. It does "something" - the fans change speed when either is pressed, and a red LED comes on briefly.

Can't ask brother about anything, he is dead. (last Jan. - like I said, I inherited this baby.) Case says NZXT. It is probable my brother built this thing - he definitely had the knowledge to do so. But he had severe COPD and likely got so bad toward the end that if something went wrong, he didn't have the energy to do much about it.

Motherboard is ASUS, M4A89GTD PRO/USB3. 850 watt PSU, Radeon HD5870 Graphics card - the biggest graphics card I've ever seen! (Full length, double height.)

MB has outputs for a full 7.1 Dolby Surround system - could be very nice! :-)

[webheart]

Diagnosis: Your problem is the power supply. Either all of the wires are not connected or something inside has burned.

[Gideon7]

According to the user manual, your mobo uses beep codes. See page 2-10. It also has LEDs for bad memory and good power. Again see the manual.