HP dc7800 minitower still beeps 4 times and no startup

[asifmuhammed1998]

Hi all,
I have HP DC 7800 convertible minitower PC.but it has a problem.now it won't start.it beeps 4 times and no led blinking. I removed every components hard disk,rams,GPU,CD drive and everything but it still keeps beeping 4 times and won't starting....before removing it beeps 4times....please help me...
Any one please......

 

[Calvin7]

That appears to be a 2007 model.
I suggest replacing CMOS battery - CR 2032.
https://www.officedepot.com/a/products/909403/Energizer-3-Volt-Lithium-Coin-Batteries/

HP - 365 WATT POWER SUPPLY FOR DC7800 DC7900MT (437799-001). REFURBISHED
https://www.serversupply.com/products/part_search/pid_lookup.asp?pid=116149&gclid=CjwKCAiApJnRBRBlEiwAPTgmxHjD1D_JRCnqwc03ggwZUE6fuPFL14DXXpvEDtBbImPQr24aBGNLWxoCaTIQAvD_BwE

 

[neatfeatguy]

It's hard to say for sure, trying to find useful information on the motherboard and audio beeps is a bit tough.

A couple of posts of people mentioning the same things usually result in no resolution that I saw. It could be something faulty with the motherboard or maybe RAM or perhaps an issue with the PSU not providing proper power for the system......

 

[asifmuhammed1998]

That appears to be a 2007 model.
I suggest replacing CMOS battery - CR 2032.
https://www.officedepot.com/a/products/909403/Energizer-3-Volt-Lithium-Coin-Batteries/

HP - 365 WATT POWER SUPPLY FOR DC7800 DC7900MT (437799-001). REFURBISHED
https://www.serversupply.com/products/part_search/pid_lookup.asp?pid=116149&gclid=CjwKCAiApJnRBRBlEiwAPTgmxHjD1D_JRCnqwc03ggwZUE6fuPFL14DXXpvEDtBbImPQr24aBGNLWxoCaTIQAvD_BwE

 

[asifmuhammed1998]

Placed a battery 2032....but it won't work...... The PC later works with these components but now it won't work.....nothing has changed in the PC.....

 

[hang-the-9]

4 beeps is a power failure. Could be a bad power supply but also something wrong with the motherboard socket.