When I power on it starts then stops (nothing on screen) then after 2 seconds powers up, still nothing on screen. All fans are working, drive lights but nothing on screen. The keyboard power light flashes and main power light is on, otherwise it is dead. The hard drive works fine on another PC.
I presume the flashing ketboard light is telling me something but I don't know what and can't find Presario tech support at HP websites.
They discuss a flashing power led on this site, but I believe they are referring to an led on the power supply itself. Perhaps the led on the keyboard and the led on the power supply are both flashing...
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So there is not so much as a BIOS message on screen? Any beeps? If there is no life at all, you have a CPU/motherboard failure. This may be direct or indirect (e.g. no power to MoBo). Check your connections. Otherwise, your boot device may not be operating. This is usually a dead or disconnected HDD. Check that it is plugged in. Does it get warm? Can you feel any vibrations from it? It should spin even if your cpu is dead but MoBo is alive.
When you press the power button do you hear the fan running, hear the disk drive running, see any lights, do you hear the cd drive click once and see the light come on briefly on the cd drive door? If you see all the aforementioned then it is surely trying to boot. Computers don't boot mainly because of the following problems. 1) Bad Power Cord or Power Supply. 2) Electro Static Buildup. 3) Bad Motherboard 4) Bad boot or system files. Remove the Power Cord and the battery if it's a laptop. Press and Hold the Power Button for 30 Seconds. Then replace only the Power Cord and try hitting the Power Button. If it boots you had an Electro Static Buildup. If you have boot or system files that are missing or corrupt normally the system will be telling you that on an error message that appears on the screen. Does your system show you anything on the screen when you press the Power Button? If not you have a Power Supply or Motherboard issue.
Disconnect the drive and try to boot to the BIOS (usually with F1, F2 or Delete key). If that doesn't work, try removing all cards from the computer (except a video card if the video port is not on the motherboard). If you can boot this way, try inserting back any removed cards to see what hangs it. Do you hear any beeps when the computer is booting (beep codes)?
what u may have done is wwhen u were installing the new board, gave a static shock to the system...that will cause only the fans to come on and nothing more...this is a bad problem bc u cannot fix it...if u figure out something else is wrong, and it gets fixed, let me know
nothing to do with the ram ... this motherboard sometimes locks, ( dont ask me why) but if you take out the power cord for 5-10 minutes and then press and hold the front power button on the machine (about 10 seconds) it will reset the board. Plug in the power cord and the basic items, sound, video etc ( some usb devices tend to stop it booting to) boot into windows. Then add the rest of your usb devices ..
hold the power button for 10 seconds it turn off ur cpu and then start the cpu and hold F5 key u get windows boot menu select safemode try to login after login check in the controlpannel poweroptions chek in advance option see the menu down wheather it is in standby then change it to shutdown and apply the setting. and check it out it may work r else please try to repair the os.
Firstly the keyboard does blink, but do you hear 2 beeps one then another a few seconds later, if not memory or graphics fault.
Are you able to start in safe mode(press F8 when pc is booting up)when menu comes up highlight 'Start windows with last known good configuration' then press enter and it should re boot.
The graphics card(if it's not onboard)may need to be removed and re seated, also the memory.
Also check hard disk drive ide and power cable.