Desktop crash and boot problems.

Hello,

I have been working on trying to fix a family members computer that is having some trouble.

It is an older HP desktop. recently upgraded to windows 10. Problems started around the time the upgrade was completed, although I do not THINK it is related.

**Specifications:**

hp pavilion p6310y

windows 10 home 64bit

6gb ddr3 ram

amd athlon II x4 630 2.80 ghz quad core

1tb caviar green HD

was running nvidia geforce 9100 intgreated, currently using an nvidia (210 or 220) 1gb

**The Problem:**

The computer will function normally, then when left idle it will go to sleep. Then after an indeterminate amount of time it will start emitting one of 2 beeps; one is an endless solid tone, the other is an endless rapid beep. The computer then needs to be force shut down by holding in the power button.

When trying to boot after this, the computer doesn't seem to POST, no signal gets picked up from the monitor, and it doesn't sound like fans or hard drive spin up, and there are usually no beep codes when attempting to start up.

When this happens, the computer will boot properly if and only if the power is unplugged from the power supply and re-plugged, after which it will boot and function as normal, until it is left asleep and crashes again.

**Measures Taken:**

As of yet I have been unable to intentionally replicate the conditions of failure. I have tried re seating all the ram, trying to boot on each ram stick individually, using different monitors, using analog plug in, DVI, and bypassing the on-board video by installing a spare graphics card. I have looked through the power settings in windows 10 and disabled quick boot. I have checked the BIOS boot order.

I am currently thinking that the issue might be related to the power supply, but i want to know if there is anything else i can try before having them buy a new PSU, either solutions, or ways to isolate the problem.