Desktop HP G4 not starting

[boli2A]

Hello all and thanks for reading me.

My desktop is a HP G4 with 8G° RAM. This computer was working like a charm.

But since a few days, when i press the power button i've  a visual and audible alarm :

5 red long beeps and 7 white short beeps

I tried to so swap off/on the memory and the graphic card, but had still the same issue !

I test memory and graphic card on an other computer (same brand, same model), they both works normally.

If you have any solution I'm interested.

Thanks for helping me

[BeemerBiker]

Does not sound good.

If your system is HP 400 G4 MT then page 91 lists the "beep codes"

http://h10032.www1.hp.com/ctg/Manual/c05381692.pdf

The beep codes go only up to 5.5 (5 long 5 short) and the problem is always the system board.

You did not list your product ID so I had to guess the 400 G4 MT so possibly the 7 short is identified in a different manual but HP uses the 5 long for the motherboard.

You might consider unplugging from power and do a CMOS reset using jumpers (if any) or carefully remove the battery for 10 seocnds.

Also, look for anything suspicious like a huge amount of dust, stains on the motherboard, bad capacitors, etc.