O.k. this problem happened not too long after using a air duster cleaner to clean inside computer to remove dust,i have done this plenty of times before,the day i did this the computer didn't turn on at all,when i pressed power button,nothing at all,but after about an hour or so later,it turned on,since that time no problems.Recently same issue has come up again if i shutdown computer it won't start up,no fans,no lights,nothing.I have checked the power cord,with a multimeter it is getting power,so is the monitor and everything else on power surge protector.What happens it takes numerous times till it finally starts up again,when it does,everything works fine no errors,nothing,runs good.If i shut it down,have same issue getting it going again,take many times to start it by pressing power button.My searching for explanation to this problem either points to power supply or motherboard.Now if it is the motherboard,why would it run flawless,when it finally gets started? To me seems like a failing PSU,but i do not want to buy one,try this,till i can know,what it can be,any answers or help,much appreciated.The system is around 7 yrs. old here are specs.
MS Windows 7 Home Premium 32-bit SP1
CPU
AMD Athlon 64 X2 5000+ 52 °C
Brisbane 65nm Technology
RAM
4.00 GB Dual-Channel DDR2 @ 326MHz (5-5-5-15)
Motherboard
ELITEGROUP MCP61PM-AM (Socket AM2 ) 40 °C
Graphics
ASUS VS229 (1920x1080@60Hz)
NVIDIA GeForce GT 610
Hard Drives
488GB Western Digital WDC WD50 00AAKS-00TMA SCSI Disk Device (ATA)
Optical Drives
HL-DT-ST DVDRAM GSA-H40N ATA Device
Audio
Creative X-Fi Audio Processor (WDM)