sometimes computer wont boot

sayanghosh48

Honorable
Oct 27, 2013
14
0
10,510
i have a computer for 3 years without any problem. suddenly the comp wont boot.i cant even get it to show the BIOS screen. I checked all connections, cleared dust, checked ram, swapped the ram in ram slots(i have only stick of ram, but borrowed someone else's ram to check if ram was faulty-was not) without any avail. after 5 hours i tried again and it booted without any problems. then again it wont boot. during this time the fans of cpu gpu and psu all runs and the cpu light is on, but nothing displays on monitor, only the lg logo(my monitor make) and monitor goes to sleep mode and the keyboard lights are not on, and blinking led indicator does not blink. in short,it boots when it wants to. but once the system boots, it works fine without any problems. i inserted a new cmos battery but no changes. i tried with a diferent psu but no changes.
can be it a motherboard problem? it doesnt look like it because if it was, the the computer would not run ever right? but it boots up sometimes and runs fine.
or can be a corrupted bios? since the bios is not loading, but the motherboard led indicator is on
my config:
amd athlon x2 260
asus m4n68tmlev2
4 gb kingston ram
500 gb seagate sata
corsair vs550 psu
gtx 650 ti graphics
 


can the cxapacitors be replaced or do i have to buy a new motherboard altogether?