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if the power-light comes-on, and you hear the HDrives or Fans spin-up, then you will need to take to repair shop for diagnostics, it could be a bad PSU or Motherboard.
If it does not, then most likely a PSU issue, (very rare cases can still be a Motherboard prob.)
Unfortunately, whenever a PSU fails, there is a possibility that damage occurred to the RAM Memory, Hard Drive, or Motherboard; in single or multiple combinations. This is why a PC repair shop is best, as they have the necessary equip to test.
Well i suggest you not to bother turning on your PC at all if it is water damaged it is a safety hazard hopefully you have insurance, i suggest getting a new PC do not attempt to turn it on if it is water damaged.
The PSU has some overload protection but not the Mobo power buss. If you were lucky, you only shorted the PSU 12/5 volt output to the Mobo ground which took out the PSU. BUT if the PC will not start-up the 12V power buss on the Mobo was probably damaged as a result of accidentally grounding it with the fan plug.
It's impossible to identify which logic has been damaged without a schematic, and even if you had one, you would need specialized tools and parts to repair the board. Sorry, but the days of repairing these kinds of components are long gone.
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Try this to get it at-least back on with your PSU that fits in the case.open up yourcomputer case, locate your power supply. With the AC cord still plugged in , unplugged the connectors to your motherboard from the PSU and wait about 10secs. Then replugged them in. This should power on your PC. Also, You wanna check around where the PSU connects to the motherboard and make sure there is no damage. No burning,Discoloration anything that could be potential damage.
Hope this works atleast to get the PC booting up.
It's quite difficult to access (removal of back cover, base including PSU and HDD) and once you do get to it you'll find it's a laptop-style video card. It's secured to the TV card and has proprietary plugs that I have not been able to match. My video card went bad (white lines, artifacts, etc.) and unfortunately that seems to be the kiss of death for this system as finding a replacement is impossible (for me, at least). Able to salvage the hard drive, cpu, ram, and some smaller items, but the rest are proprietary and won't work on other desktops or laptops.
Check that the ram memory hasn't come unseated from the mobo. If you are using an above board video card also check that it is properly seated as well.
The clicking noise from the PSU is kinda perplexing though...
There are several possibilities within two categories:
SOFTWARE (you are using MS, so this is more likely) HARDWARE these symptoms can be caused by bad battery and/or bad PSU (AC Power Supply Unit)
Software: You may have a virus, or may have damaged the NT kernel, or some critical software components by installing cheap games or bad SW. Read the recovery instructions on your XP CD to boot and run recovery and/or utilities that might repair the laptop OS. If you have no CD, try booting and hitting F6 key after BIOS screen... then explore the options there. Next, try booting and hitting F8 key after BIOS screen... then explore the options there.
If there are no problems repaired or evident in software, you should remove the battery, plug in the PSU and try booting. If all goes well, your battery is probably bad. If NOTHING happens, then your PSU is definitely bad (or the PSU cable/jack/connection to your computer is bad)
Conversely, remove the PSU and boot only with the battery. If it boots up (or goes farther than it did before) then the battery may be low/damaged BECAUSE the PSU is bad. If your laptop does not even open/get at least to BIOS screen, then the battery is dead. Try recharging overnight with laptop off but plugged into AC. If it is the same in the morning, replace the battery.
Both the battery and PSU can be checked with a VTVM, to compare voltage/output levels, with the ratings on the labels
the reason for the melting could be down to one or the other, i would deffinately change the motherboard as it may be the reason for the melting and just keep an eye on the PSU
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