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No offense, but Honestly that is to vague of a question. Those symptoms sound normal for a slow computer. You should consider how much you have to put towards upgrading your computer, if it is too slow for you. Taking your computer into a service center like geek squad or a local computer specialist would allow access to tools that are required to assess the underlying issue or performance.
Using online tools to identify computer issues is extremely dangerous to your data due to possibility of downloading malware and viruses if you are not familar with identifying risks. If you need further help, I’m available over the phone at https://www.6ya.com/expert/chris_51d7c1b240c21e38

we on planet earth do not run XP now. end it;. XP is virus magnet. use W7 install. ok? nothing LESS now./ XP internet exploder is now dead on the web. banned. ok>? http://pcdied.com/XP-sux-sg.html

old post. odd symptoms. the OP never once told the full story what works good and not. XP runs? surely it can, 0.4% 2016 run XP world wide and way less now 2018, due to virus magnet status. do not run XP , and the fan is not XP job. BIOS runs the fans. if the PC runs at 56C or so and the fans slow that is normal The bios only speeds up facts at start, the slows them and monitors CPU heat and GPU heat if they rise too high the fans spin up. this is how all PC run my fancy desktop has 600rpm fans right now, due to cool running CPU. 4 pin fans can do that magic. The reason for the fast spin up is easy to learn turned on fresh. the PC ASSUMES the chip are hot. say PC parked in a trunk at 120F the you go indoors and turn it on so to be safe, it runs them fast (like at BIOS machine code instruction 1 or first. it spins them up then watches CPU temps live. this can take a few seconds to do a scan, see a TREND if the trend show low, temps, it then uses a PWM fan table in the BIOS, and set the fan speed off that hard coded table) get that? now say PC was hot turned on then it slows only if fast fans speeds can lower the CPU temp then rule 2 and 3 on BIOS CPU temps if bios does not like say 80C it can turn itself off. if failing to do that, say fan is dead, learn that ALL CPUs from P4 up can turn them selves off they HALT. ALL AMD and intel CPU do that. ok? and did you really clean it is the RAD clean.? http://www.pcdied.com/overheated.html

DX4380g , you forgot to say DX? the Desktop PC? why not ask gateway (acer.com) they made it, they support it, (if do this old) and they can tell you. APU, auxiliary power unit?? I guess you meant , A10 AMD CPU? ? Socket FM2 processors. it will not help you, ok, so do not spend money here. no reason giving by you, gaming, dreams with weak PC? each PC made has a qualified, CPU support list. (for SURE)' best is to ask them first, ok? every one, but does ACER? they are the underdog of PCs. IDK all they have is here, under DX http://www.gateway.com/gw/en/US/content/drivers-downloads no qualified memory page. no qualified cpu page acer stinks in my book. first things first. first is what, does the mobo have a socket. seems yes, but what socket is there. says FM2. yes. newly made had AMD A6-5400K 3.60GHz 1MB so can a A10 work, IDK. ask acer. not much there, but do ask, maybe someone and dig deep in acers bowls. https://community.acer.com/en/search?adv=1&search=DX4380g&title=&author=&cat=all&subcats=1&archived=1&tags=&discussion_d=1&discussion_question=1&discussion_poll=1&comment_c=1&comment_answer=1&within=1+day&date=

I see that this monitor has a DVI input, in additon to the VGA input. I suggest getting a suitable cable to use the DVI input, to see if the fault replicates. If it doesn't, you have identified the problem - an issue with the analogue signal processeing circuitry in either the monitor or the computer. The monitor's auto sleep analogue circuitry, for example, may not be sensing a signal, and going to sleep. BTW, if you use a DVI-DVI cable, you avoid the video signal ever going through an analogue stage, and the image will also be purer.

you did this wrong. step 1 is run full HDD tests, smart test too. we use linux demo disk, NO OS in the world loads to a bad or weak HDD. never !!! http://www.pcdied.com/linux.html

To see how to open your 3550, go here: https://www.youtube.com/watch?v=sTzhVUM0J2U To see power connector repair for your 3550, go here: https://www.youtube.com/watch?v=wHqJAw1gOXI Good luck.

Acer Gateway it is, (owned by too) NO OS stated, why in the world post lacking such key fact? my guess , you forgot and not its dead. so reload the OS, or F8 safe mode, load the gateway driver, from gateway.com go there get it and put it on a USB stick then in F8 go to device manager, and click update video chip, there, and pick my driver from my media option , go to usb stick and load your driver. i the internet is dead, now. use F8 Safe mode, with internet, then click driver update on video chip and it updates from MS.com using PnP plug and pry. but again NO OS stated, i can see its XP,vista,w8 for sure but which one? what did PC come with did you upgrade the PC's OS ever. or buy w7 from MS.com and load it. Gateway does not sell old install disc's, no OEM does.

I like to take my laptop apart and clean it and learn how is put together I use a small blower mini screw drivers a magnet to keep screws together I learn where the hard drive is and memory card is. my advice is if you decide to clean yours if you have the tools I would give it a try.

Press Ctrl alternative delete at the same time to reboot your system

can you login? sometimes yahoo servers just don't work either. i used to use Yahoo but they kept changing formats for mail, browser look, etc. without notifying people. Then they have so many problems they keep failing to work! I would give up, sync to Microsoft mail or Google. THey rarely are down or have problems and if updates are coming, they notify you before hand.

First check to see that all of the cables are connected and fastened in tightly between the monitor and computer using the tiny handscrews on them at the monitor side and on the video card where it connects to your computer. Also, the resolution detection circuitry in the monitor could be going bad, or you could have a bad video cable connecting it to the computer, or lastly, the video card in your computer could be going bad. A few separate things you can try: 1. If you have a spare video cable, connect using the spare cable to the monitor and the computer to see if this corrects the issue. 2. If you have another monitor, I would connect it to see if you continue to have video issues. 3. Consider buying a new monitor.

First thing to do is to re-new the CMOS battery on the motherboard. When this is nearing the end of its life it will go into power saving mode.

Generally on the keyboard there is a touch pad on/off hotkey. If you didn't change it, it should be the "Fn" and "F7" in combination.

Normally this would be an easy fix if it had a cable style dc jack, but this model is soldered to the mother board. I have done 100's of them and will tell you that unless you know how to use that soldering iron correctly then perhaps you may want to take it to a shop to have It repaired. Before you even start look at the location that the DC jack goes to make sure there is no damage to the mother board. That is not a normal DC jack either, there are 9 locations that need to be soldered. I would suggest to take it to a repair shop

this old PC has CCFL lamps and most are dead now, for just that reason. 2008 PC>? 2 year before first PC had LED back lamps. not photo of your screen messing up, so no ACCURATE ANSWERS possible. this line is it 1 pixel tall? or huge line, huge is dead CCFL tube. line 1 pixel or so is bad LCD. there you go me pretending to see your screen. this PC is trash, it is not worth fixing for sure. try the VGA jack on the rear to a real modern 2010 or newer monitor if that works use that. till the hDD dies. next.

bad hdd is top cause a tech simply tests the HDD , now. ask;

Flat batteries in the remote? Batteries the wrong way around in the remote? Corroded battery terminals in the battery holder?

If it has no sounds of say music that you would hear of its system launching then its possible its Back up battery has failed an scrambled the Bios, this is a disc like lithium battery in a holder How to Install CMOS Battery in Gateway Laptop Gateway Netbook disassembly LT2802U These may help you though I have not seen where its located but that second link might give a clue if you watch it through. Hope this helps..........