After I press on button of my desktop, the computer is not booting. Then I have to press the restart button 3 to 4 times to boot the computer.
if you press the physical button, the problem is that your button is faulty, try servicing
check the connection it may be got olt that's why its happining.....or reconnect it properly
you may try these step...
1. clean cpu cooler fan and heat sink
2. clean ram slot
3. when computer starts clean run > %temp%
if the power button fails to boot up your computer, the problem is with your power supply. when you first boot up the computer, it uses more current than while it's on working state. for this, there are capacitors to give the power boost in the start. if these capacitors fail to charge them selves at the first time when you start the computer, the pc won't boot. I don't think that pressing the restart button is helping you, but it gives the necessary time frame to get the capacitors charged.
that's why it takes time to boot up your computer. I would recommend you to change the power supply.
there is another exception that can make this problem happen. it's a fault in your mother board. but I don't think that if there is a fault, it will boot after few seconds.
On my desktop I have to holed the start button a few seconds or it will not start, A quick press usually does not work.
Three possible issues:
Your power supply is shot.
Bad power switch.
worst case scenario; Your motherboard is bad.
I would check the switch first, then cables (including the power cable to the mobo [motherboard]), then check the PSU to make sure that you're getting accurate power output, then check the mobo it's self. A friend of mine had this issue once and we found out the mobo had a short on it that we temporary fixed by loosening one of the mobo screws to the case (to relieve pressure off the bad area). I personally had my front switch simply go bad which i just tested by hooking up the reset switch to the mobo's power switch pins and putting the power switch on the reset button switch - and shazam it was the switch thankfully.
Reset the CMOS battery.
An issue i had once, the power button was problematic. If this is the case, an easy solution is to put the cables that are connected to the power button to the reset button. There won't be any reset button in that case, but the computer will boot up.
power supply..,replace it with a higher watts ,or with a new one
have you tried unplugging from the mains, leaving it for a while and then trying again?
If PC boots first time, then the issue is either the PSU or your power cable.
might be your hard disk is failing....
Did you change the volts of your CPU??
Could be a failing PSU.
So the PC won't boot with the power button only the reset button 3/4 times. How long as this been going on, has it just started, did you move your PC at all, we need more info. But I would check for loose connections on the Power/Reset buttons.
May be there is a loose connection with the restart switch or the power switch. You refer to the nearest service center.
Probably a hardware issue. Is it under warranty? We had this problem on a bunch of Dell Optiplex 790's that had to had them replaced.
possible hardware problem, check cables, remove ram clean dust and replug
if still do not work reset cmos battery
remove the graphic card and boot on the on board graphic card.
Is there any error messages or just a blank screen?
If it is just a blank screen look at the monitor light when you have turned on the computer, is it dimmed somewhat? If so, try another monitor.
Maybe the spring needs replacing, or there are loose wires.
What version of Windows are you using?