Have a HP m7760n pc that would not power on. Motherboard or CPU is bad. Power supply was replaced with a new one and same problem exists.
Did all the steps in the troubleshooting/diags (Cleared CMOS, removed battery, removed mobo from case, etc.) but same problem after replacing the motherboard TWICE.
With bare minimum (CPU, HDD, 1 RAM stick), pc will power on but no BIOS, no Video (monitor is good). CPU fan runs and HDD runs constantly (with LED light on) and also one constant beep from internal speaker. DVD drive will spin but will not read a recovery boot disk. PS2 keyboard lights with Num Lock pressed but no response; also no USB power.
With CPU in, PC can be powered down with front switch pressed for 6 seconds straight. With CPU removed, power switch does nothing and power cord must be pulled to power off.
What has me perplexed is that this is the same problem experienced with 2 different motherboards - one was an ASUS P5LP-LE direct match to the original, and the 2nd was a Foxconn G33M. I don't believe these replacement mobos are new, but they were not physically damaged in any way.
Any help would be appreciated in isolating the defective part(s), especially how to isolate bad CPU vs. bad mobo. No BIOS or POST load has me still leaning towards the mobo, but after replacing it twice I'm not so sure.
Did all the steps in the troubleshooting/diags (Cleared CMOS, removed battery, removed mobo from case, etc.) but same problem after replacing the motherboard TWICE.
With bare minimum (CPU, HDD, 1 RAM stick), pc will power on but no BIOS, no Video (monitor is good). CPU fan runs and HDD runs constantly (with LED light on) and also one constant beep from internal speaker. DVD drive will spin but will not read a recovery boot disk. PS2 keyboard lights with Num Lock pressed but no response; also no USB power.
With CPU in, PC can be powered down with front switch pressed for 6 seconds straight. With CPU removed, power switch does nothing and power cord must be pulled to power off.
What has me perplexed is that this is the same problem experienced with 2 different motherboards - one was an ASUS P5LP-LE direct match to the original, and the 2nd was a Foxconn G33M. I don't believe these replacement mobos are new, but they were not physically damaged in any way.
Any help would be appreciated in isolating the defective part(s), especially how to isolate bad CPU vs. bad mobo. No BIOS or POST load has me still leaning towards the mobo, but after replacing it twice I'm not so sure.