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You could tinker with it, but if you take it in to a shop there going to charge you more then its worth. I would say its time for a new computer. Even the slowest computer these days at the store is going to be 10 times faster then what you currently have.
Looks as if the connector wire to the power switch in front has become loose or removed from the pin provided on the motherboard due to the air. Check any loose connections or loose wires inside the cabinet & secure them. That should solve the problem
looks like the connections in your system are loose.
just do this remove all the connections hdd,dvd other pci card or graphic cards.any other extra things other than motherboards own. donot connect the hdd or dvd. then take out the ram and the battery on the motherboard. wait for a while then place the battery back and then insert the ram. place the smps connection to the motherboard and then power up the system. you should now get the display and warnings that no bootable devices are found.
and check the bios settings after a successful display. after that connect the devices one by one and check their detecting in the bios then you can keep all the extra cards. this problem might be causing because of the bad CMOS checksum. just reset the bios through the jumper settings or remove the battery then the system will work fine
Follow the wire from the power switch to the motherboard
Remove the wire from the 2 pins
Use a screw driver and touch both pins at the same time, creating a connection
That would be the equivalent of switching the computer on, if it powers on then you know the switch is bad and just need to replace it. If it does not turn on I would be 99% sure it is the motherboard as you already swapped the power supply.
Remeber that Vista OEM is activated with your harware and if you change it so much it will deactivate with your licence. press F6 at boot to have the options like "boot with system critical drivers only without LAN" and see if it boots this way, then uninstall all drivers and reboot, install the drivers for the new motherboard. If this doesn't work you might need to reinstall Win and I'm pretty sure you won't be able to activate it because the hardware key has changed.
If you can't get into safe mode by pressing F9 during start-up you may have to reload windows. If you can get into safe mode, back-up data and reset the PC to the last configuration on which it worked. When you see the "Please select the operating system to start" message, press the F8 key.When the Windows Advanced Options menu appears, use the ARROW keys to select Last Known Good Configuration (your most recent settings that worked), and then press ENTER.